telecentric optics
An optical device and telecentric technology, applied in optics, optical components, installation, etc., can solve problems such as deterioration of telecentricity and reduction of image sharpness
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no. 1 approach
[0034] Figure 1A and Figure 1B is a schematic sectional view showing the telecentric optical device according to the first embodiment.
[0035] Figure 1A Indicates the assembled state, Figure 1B Indicates a detached state.
[0036] Such as Figure 1A As shown, the telecentric optical device 1 according to the present embodiment is provided with a front-stage lens section 10 arranged on the object side and a rear-stage lens section 20 arranged on the image side. Both the front-stage lens portion 10 and the rear-stage lens portion 20 are substantially cylindrical. The first telecentric lens surface 11 is provided on the object side of the front-stage lens unit 10 , and the second telecentric lens surface 21 is provided on the image side of the rear-stage lens unit 20 . The front-stage lens portion 10 and the rear-stage lens portion 20 are connected together along the optical axis AX.
[0037] In the telecentric optical device 1 , the focus position f1 of the first telece...
no. 2 approach
[0053] Figure 3A and Figure 3B is a schematic sectional view showing a telecentric optical device according to a second embodiment.
[0054] exist Figure 3A In the shown telecentric optical device 1B, a roughened surface (rough surface 32 ) is provided on the optical path changing portion 30 . The rough surface 32 is a surface of the optical path changing part 30 that faces the rear-stage lens part 20 and that diffuses the light beam C2 incident on the optical path changing part 30 . In this way, it is possible to prevent unnecessary light flux outside the light passing region TR from mixing into the rear-stage lens unit 20 .
[0055] It should be noted that in Figure 3A In the illustration of , the rough surface 32 is obtained by roughening the plane perpendicular to the optical axis AX and refracts the light beam C2 to different directions depending on the incident position. Therefore, in the case of having the above-mentioned refraction surface 31, the rough surfac...
no. 3 approach
[0059] Figure 4A and Figure 4B is a schematic sectional view showing a telecentric optical device according to a third embodiment.
[0060] The telecentric optical devices 1D and 1E according to the third embodiment have a configuration in which the front-stage lens portion 10 and the rear-stage lens portion 20 are integrated.
[0061] exist Figure 4A In the shown telecentric optical device 1D, the optical path changing unit 30 is provided between the integrated front lens unit 10 and the rear lens unit 20 . The surface of the optical path changing portion 30 on the side of the front-stage lens portion 10 is roughened. In addition, the surface of the optical path changing portion 30 on the rear-stage lens portion 20 side is also roughened.
[0062] In order to manufacture the telecentric optical device 1D, a substantially cylindrical member provided with a first telecentric lens surface 11 at one end and a second telecentric lens surface 21 at the other end is formed fr...
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