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| <link:definition> 10801 - Disclosure - Accounts Payable and Accrued Liabilities </link:definition> |
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| <link:definition> 10901 - Disclosure - Income Taxes </link:definition> |
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| <link:definition> 11101 - Disclosure - Net (Loss) Income per Share </link:definition> |
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| | | <link:roleType roleURI="http://www.inradoptics.com/role/DisclosureNatureOfBusinessAndOperationsAndSummaryOfSignificantAccountingPoliciesAndEstimatesPolicies" id="DisclosureNatureOfBusinessAndOperationsAndSummaryOfSignificantAccountingPoliciesAndEstimatesPolicies"> |
| <link:definition> 20102 - Disclosure - Nature of Business and Operations and Summary of Significant Accounting Policies and Estimates (Policies) </link:definition> |
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| <link:usedOn> link:calculationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.inradoptics.com/role/DisclosureRevenueTables" id="DisclosureRevenueTables"> |
| <link:definition> 30203 - Disclosure - Revenue (Tables) </link:definition> |
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| | | <link:roleType roleURI="http://www.inradoptics.com/role/DisclosureInventoriesNetTables" id="DisclosureInventoriesNetTables"> |
| <link:definition> 30303 - Disclosure - Inventories, net (Tables) </link:definition> |
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| <link:usedOn> link:calculationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.inradoptics.com/role/DisclosurePlantAndEquipmentTables" id="DisclosurePlantAndEquipmentTables"> |
| <link:definition> 30403 - Disclosure - Plant and Equipment (Tables) </link:definition> |
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| <link:usedOn> link:calculationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.inradoptics.com/role/DisclosureOtherLongTermNotesTables" id="DisclosureOtherLongTermNotesTables"> |
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| <link:usedOn> link:calculationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.inradoptics.com/role/DisclosureAccountsPayableAndAccruedLiabilitiesTables" id="DisclosureAccountsPayableAndAccruedLiabilitiesTables"> |
| <link:definition> 30803 - Disclosure - Accounts Payable and Accrued Liabilities (Tables) </link:definition> |
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| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.inradoptics.com/role/DisclosureIncomeTaxesTables" id="DisclosureIncomeTaxesTables"> |
| <link:definition> 30903 - Disclosure - Income Taxes (Tables) </link:definition> |
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| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.inradoptics.com/role/DisclosureEquityCompensationProgramAndStockBasedCompensationTables" id="DisclosureEquityCompensationProgramAndStockBasedCompensationTables"> |
| <link:definition> 31003 - Disclosure - Equity Compensation Program and Stock-based Compensation (Tables) </link:definition> |
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| <link:usedOn> link:calculationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.inradoptics.com/role/DisclosureCommitmentsTables" id="DisclosureCommitmentsTables"> |
| <link:definition> 31201 - Disclosure - Commitments (Tables) </link:definition> |
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| <link:usedOn> link:calculationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.inradoptics.com/role/DisclosureShareholdersEquityTables" id="DisclosureShareholdersEquityTables"> |
| <link:definition> 31403 - Disclosure - Shareholders' Equity (Tables) </link:definition> |
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| <link:usedOn> link:calculationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.inradoptics.com/role/DisclosureFairValueOfFinancialInstrumentsDetails" id="DisclosureFairValueOfFinancialInstrumentsDetails"> |
| <link:definition> 41501 - Disclosure - Fair Value of Financial Instruments (Details) </link:definition> |
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| <link:usedOn> link:calculationLink </link:usedOn> |
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| | | <link:linkbaseRef xlink:type="simple" xlink:href="inrd-20201231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/> |
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| | | <link:linkbaseRef xlink:type="simple" xlink:href="inrd-20201231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/> |
| | | <link:linkbaseRef xlink:type="simple" xlink:href="inrd-20201231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/> |
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| <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/> |
| <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/> |
| <import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd"/> |
| <import namespace="http://xbrl.sec.gov/dei/2020-01-31" schemaLocation="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd"/> |
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| <import namespace="http://fasb.org/us-roles/2020-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2020/elts/us-roles-2020-01-31.xsd"/> |
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| <import namespace="http://fasb.org/srt/2020-01-31" schemaLocation="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd"/> |
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| <element name="AccumulatedDeficitMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="inrd_AccumulatedDeficitMember" substitutionGroup="xbrli:item"/> |
| <element id="inrd_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedTableTextBlock" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/> |
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| <element name="NatureOfBusinessAndOperationsAndSummaryOfSignificantAccountingPoliciesAndEstimatesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="inrd_NatureOfBusinessAndOperationsAndSummaryOfSignificantAccountingPoliciesAndEstimatesLineItems" substitutionGroup="xbrli:item"/> |
| <element name="AerospaceDefenseMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="inrd_AerospaceDefenseMember" substitutionGroup="xbrli:item"/> |
| <element name="ProcessControlMetrologyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="inrd_ProcessControlMetrologyMember" substitutionGroup="xbrli:item"/> |
| <element name="LaserSystemsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="inrd_LaserSystemsMember" substitutionGroup="xbrli:item"/> |
| <element name="ScientificRdMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="inrd_ScientificRdMember" substitutionGroup="xbrli:item"/> |
| <element id="inrd_PercentageOfRevenueFromProductsOrServices" name="PercentageOfRevenueFromProductsOrServices" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/> |
| <element name="AffiliateOfClarexMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="inrd_AffiliateOfClarexMember" substitutionGroup="xbrli:item"/> |
| <element id="inrd_LesseeOperatingLeaseOtherInformationTableTextBlock" name="LesseeOperatingLeaseOtherInformationTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/> |
| <element id="inrd_LiquidityDisclosurePolicyPolicyTextBlock" name="LiquidityDisclosurePolicyPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/> |
| <element id="inrd_PreciousMetalsPolicyPolicyTextBlock" name="PreciousMetalsPolicyPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/> |
| <element id="inrd_PropertyAndEquipmentExcludingLeaseholdImprovementsMember" name="PropertyAndEquipmentExcludingLeaseholdImprovementsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_TopThreeMajorCustomersMember" name="TopThreeMajorCustomersMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_CustomerOneMember" name="CustomerOneMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
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| <element id="inrd_CustomerThreeMember" name="CustomerThreeMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_WorkingCapital" name="WorkingCapital" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit"/> |
| <element id="inrd_NumberOfMajorCustomers" name="NumberOfMajorCustomers" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/> |
| <element id="inrd_OfficeAndComputerEquipmentMember" name="OfficeAndComputerEquipmentMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_WriteOffOfFixedAssets" name="WriteOffOfFixedAssets" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit"/> |
| <element id="inrd_ConvertibleSubordinatedDebt1500000Member" name="ConvertibleSubordinatedDebt1500000Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
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| <element id="inrd_NumberOfSharesAndWarrantsComprisedInUnit" name="NumberOfSharesAndWarrantsComprisedInUnit" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/> |
| <element id="inrd_UsSmallBusinessAdministrationNotePayableMember" name="UsSmallBusinessAdministrationNotePayableMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
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| <element id="inrd_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsInventory" name="DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsInventory" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit"/> |
| <element id="inrd_ExercisePriceRangeOneMember" name="ExercisePriceRangeOneMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_ExercisePriceRangeTwoMember" name="ExercisePriceRangeTwoMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_ExercisePriceRangeThreeMember" name="ExercisePriceRangeThreeMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_EquityCompensation2010ProgramMember" name="EquityCompensation2010ProgramMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_NumberOfPartsOfEquityCompensationProgram" name="NumberOfPartsOfEquityCompensationProgram" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/> |
| <element id="inrd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit"/> |
| <element id="inrd_DefinedContributionPlanEmployerMatchingContributionInShares" name="DefinedContributionPlanEmployerMatchingContributionInShares" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/> |
| <element id="inrd_DefinedContributionPlanEmployerMatchingContributionInCash" name="DefinedContributionPlanEmployerMatchingContributionInCash" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit"/> |
| <element id="inrd_CustomersInEuropeAsiaJapanMember" name="CustomersInEuropeAsiaJapanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_MajorCustomersOneMember" name="MajorCustomersOneMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_MajorCustomersTwoMember" name="MajorCustomersTwoMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_MajorCustomersThreeMember" name="MajorCustomersThreeMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_TopFiveCustomersMember" name="TopFiveCustomersMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_EquityCompensationPlan2010Member" name="EquityCompensationPlan2010Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_EquityCompensationPlan2000Member" name="EquityCompensationPlan2000Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_WarrantsIssuableOnConversionOfSubordinatedConvertibleNotesMember" name="WarrantsIssuableOnConversionOfSubordinatedConvertibleNotesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_EffectiveIncomeTaxRateReconciliationChangeInFederalStatutoryIncomeTaxRate" name="EffectiveIncomeTaxRateReconciliationChangeInFederalStatutoryIncomeTaxRate" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/> |
| <element id="inrd_PaycheckProtectionProgramLoanMember" name="PaycheckProtectionProgramLoanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/> |
| <element id="inrd_LongTermNotesPayableOther" name="LongTermNotesPayableOther" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit"/> |
| <element id="inrd_IncreaseDecreaseInAccruedInterestOnRelatedPartyConvertibleNotesPayable" name="IncreaseDecreaseInAccruedInterestOnRelatedPartyConvertibleNotesPayable" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit"/> |
| <element id="inrd_NonCashInvestingAndFinancingActivitiesExchangeOfPreciousMetals" name="NonCashInvestingAndFinancingActivitiesExchangeOfPreciousMetals" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit"/> |
| <element id="inrd_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearSix" name="LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearSix" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit"/> |
| <element id="inrd_CapitalLeaseWeightedAverageDiscountRatePercent" name="CapitalLeaseWeightedAverageDiscountRatePercent" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant"/> |
| <element id="inrd_LesseeCapitalLeaseRemainingLeaseTerm" name="LesseeCapitalLeaseRemainingLeaseTerm" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/> |
| </schema> |