INTEGRATED OPTICAL MODULE AND OPTICAL PICKUP
PROBLEM TO BE SOLVED: To provide an integrated optical module and optical pickup that can reduce shift of an optical axis due to temperature changes. SOLUTION: This integrated optical module and optical pickup use, for the material of the holder 26, zirconia having a linear expansion coefficient clo...
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| creator | SHIMOZAWA RYOSUKE UMEZAKI TAKESHI |
| description | PROBLEM TO BE SOLVED: To provide an integrated optical module and optical pickup that can reduce shift of an optical axis due to temperature changes. SOLUTION: This integrated optical module and optical pickup use, for the material of the holder 26, zirconia having a linear expansion coefficient close to the borosilicate glass BK7 which is the material of the prism 23 and satisfying the relation of α1-α2 |
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SOLUTION: This integrated optical module and optical pickup use, for the material of the holder 26, zirconia having a linear expansion coefficient close to the borosilicate glass BK7 which is the material of the prism 23 and satisfying the relation of α1-α2<K/(s×ΔT×L1×103); when representing the maximum permissible shift of the optical axis to the light receiving element 25 by K(%), the allowable maximum temperature rise of the integrated optical module 20 by ΔT(°C), the optical axis sensitivity to be decided depending to the light receiving element 25 by s(%/μm), the linear expansion coefficient of the material of the holder 26 by α1(/°C), the linear expansion coefficient of the material of the prism 23 by α2(/°C), and the pitch between the light emitting element 24 and the light receiving element 25 by L1 (mm). Further, the holder 26 is attached to the case 22 in a manner sandwiching the light emitting element 24. 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| subjects | INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER PHYSICS |
| title | INTEGRATED OPTICAL MODULE AND OPTICAL PICKUP |
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