Manufacturing method of plastic rod-shaped lens and manufacturing method of plastic rod-shaped lens array
A technology of rod lens and manufacturing method, which is applied in the direction of lens, instrument, bundle of optical fiber, etc., can solve the problems of rod lens deformation and inability to impart heat resistance characteristics, and achieve the effect of excellent heat resistance and no reduction in optical characteristics
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Embodiment 1
[0068] Using the above-mentioned monomer interdiffusion method, the radius r is 0.30mm, the refractive index of the central axis is 1.506, and the refractive index distribution in the range of 0.22r to 0.78r from the central axis can be approximated by the above formula (1), 740nm The refractive index distribution constant g of wavelength light is 0.87mm -1 , A rod lens with a heat distortion temperature of 78℃. In this rod lens, a light absorbing layer containing a dye is formed substantially uniformly with a thickness of approximately 78 μm from the center to a range of 0.73r to 0.99r.
[0069] The obtained rod lens was heat-treated in a dryer set at 70°C (relative humidity 30% or less) for 24 hours. The heat distortion temperature of the rod lens after the treatment was 89°C.
[0070] Using a plurality of such rod lenses, using the first and second substrates made of phenolic resin with a thickness of 1.0 mm in the same manner as above, the adjacent rod lenses between the two s...
Embodiment 2
[0075] Heated and kneaded 47 parts by mass of polymethyl methacrylate at 70°C ([η]=0.40, measured in MEK at 25°C, and used as polymethyl methacrylate in the following examples and comparative examples. The same substance), 30 parts by mass of the tricyclic ring represented by the following formula [5.2.1.0 2，6 ]Decyl methacrylate,
[0076]
[0077] 23 parts by mass of methyl methacrylate, 0.25 parts by mass of 1-hydroxycyclohexyl phenyl ketone, and 0.1 parts by mass of hydroquinone were used as the stock solution for forming the first layer. Heat and mix 50 parts by weight of polymethyl methacrylate and 10 parts by weight of tricyclic [5.2.1.0] at 70°C 2，6 ] Decyl methacrylate, 40 parts by mass of methyl methacrylate, 0.25 parts by mass of 1-hydroxycyclohexyl phenyl ketone, and 0.1 parts by mass of hydroquinone were used as the stock solution for forming the second layer. Heat and knead 50 parts by mass of polymethyl methacrylate, 10 parts by mass of 2,2,3,3,4,4,5,5-octafluorope...
Embodiment 3
[0088] The rod lenses of Example 2 were processed in a constant temperature and humidity machine set at 60° C. and a relative humidity of 90% for 24 hours. The heat distortion temperature of the rod lens after the treatment was 84°C.
[0089] Using these rod lenses, they were produced in the same manner as in Example 2, and a rod lens row of one row (lens length 4.4 mm) was produced. The conjugate length in 525 nm of the manufactured rod lens array is 10.0 mm, and the average value of the MTF of 12 Lp / mm is 75%. The rod lens array was heat-treated for 1000 hours in a constant temperature and humidity machine set at 60°C and a relative humidity of 90%. The conjugate length of the 525 nm wavelength light of the treated lens array is 10.0 mm, and the average value of the MTF of 12 Lp / mm is 75%. There is no change in the optical characteristics before and after the heat treatment, and the heat resistance characteristics are excellent.
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Abstract
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