JPH0525875U - Back focus adjustment mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] The reference axis for C-mount and CS-mount switching and the reference axis for fine adjustment are made the same, and the optical axis of the lens and CC
A back focus adjustment mechanism that minimizes the variation with the center of D. [Configuration] Switching between C mount and CS mount is done by C
The convex portion 6 (guide member) of the holder 2 to which the CD is attached is guided by the concave portion 5 (guided member) of the base 1 provided correspondingly, and is moved back and forth. Rotates the fine adjustment cam provided on the slider 3 so that the convex portion 6 (guide member) of the holder 2 moves to the base 1 as the slider 3 previously mounted on the holder 2 moves back and forth. Recess 5 (guided member)
Performed by moving back and forth guided by.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a CCD camera and a back focus adjusting mechanism.

[0002]

[Prior Art]

 A back focus adjusting mechanism such as a surveillance camera using a CCD had a structure as shown in FIG. 2A and 2B show an example of a conventional back focus adjustment mechanism. FIG. 2A is a top view of a main part, and FIG. 2B is a cross-sectional view of the main part C-C '. Switching between the C mount (focal length 17.5 mm) and the CS mount (focal length 12.5 mm) is performed by temporarily fixing the holder 12 with CCD and the leaf spring 17 with the set screw 19 The convex portion 20 of the slider 13 The (guide member) is guided by the concave portion 15 (guided member) of the corresponding base 11 to move back and forth, and the fine adjustment is performed by the fine adjustment cam 14 provided on the slider 13. By rotating the (eccentric cam), the convex portion 16 (guide member) of the holder 12 is moved back and forth while being guided by the concave portion 21 (guided member) of the slider 13. When the final adjustment is completed, the base 11 and the slider 13, and the slider 13 and the holder 12 are fixed by the C and CS switching setscrews 18 and the fine adjustment setscrew 19, respectively.

[0003]

[Problems to be solved by the device]

 In adjusting the back focus, it is required to minimize the variation between the optical axis of the lens and the center of the CCD in order to make the image obtained through the lens to CCD clearer. There are two reference axes for the fine adjustment, the guide member and the guided member for fine adjustment, and the guide member and the guided member for switching the C mount and the CS mount. Since the two components are stacked, the dispersion of the central axis becomes large.

[0004]

In order to solve the above-mentioned problems, the present invention provides a guide member of a holder with CCD which is guided by a base guided member to move back and forth. A slider provided with a cam (eccentric cam) is placed on the holder, and the fine adjustment cam is rotated to move the slider, and the holder is guided by the guide member of the holder and the guided member of the base. While providing a back focus adjustment mechanism that can be moved back and forth.

[0005]

[Action]

 Since the back focus adjusting mechanism according to the present invention is configured as described above, the guide member and the guided member for fine adjustment, the guide member and the guided member for switching the C mount and the CS mount, and the guided member are provided. By making them the same, there is only one reference axis for adjustment, and because the two components of the base and holder are stacked, the variation between the optical axis of the lens and the center of the CCD can be minimized. The image obtained via the lens to the CCD can be made clearer.

[0006]

【Example】

 An embodiment of a back focus adjusting mechanism according to the present invention will be described in detail with reference to the drawings. 1A and 1B show an embodiment of a back focus adjusting mechanism according to the present invention. FIG. 1A is a top view of an essential part, FIG. It is a BB 'sectional drawing. In the figure, when switching between the C mount and the CS mount, the convex portion 6 (guide member) of the holder 2 to which the CCD is attached is guided by the concave portion 5 (guided member) of the base 1 provided correspondingly. The fine adjustment is performed by rotating the fine adjustment cam 4 (eccentric cam) provided on the slider 3 so that the slider previously mounted on the holder 2 can be finely adjusted. 3 is moved, and one end of the slider 3 is in contact with the inside of the base 1, so that the protrusion 6 (guide member) of the holder 2 is guided by the recess 5 (guided member) of the base 1 accordingly. It is done by moving back and forth. The outer peripheral portions of the base 1 and the holder 2 are held by the leaf spring 7. When the adjustment is completed, the base 1 and the holder 2, and the holder 2 and the slider 3 are fixed by C and the CS switching set screw 8 and the fine adjustment set screw 9, respectively.

[0007]

[Effect of the device]

 As described above, in the back focus adjusting mechanism according to the present invention, the guide member and the guided member for fine adjustment are the same as the guide member and the guided member for switching the C mount and the CS mount, and the base and the holder. Since it is composed only by stacking these two parts, the variation between the optical axis of the lens and the center of the CCD can be minimized, and the image obtained via the lens to CCD can be made clearer. it can.

[Brief description of drawings]

FIG. 1 is a top view and a cross-sectional view of an essential part of an embodiment of a back focus adjusting mechanism according to the present invention.

2A and 2B are a top view and a sectional view of a main part of an example of a conventional back focus adjusting mechanism.

[Explanation of symbols]

 1 base 2 holder 3 slider 4 fine adjustment cam 5 base recess 6 holder protrusion 7 leaf spring 8 C and CS switching set screw 9 fine adjustment set screw 11 base 12 holder 13 slider 14 fine adjustment cam 15 base recess 16 Holder convex part 17 Leaf spring 18 C and CS switching set screw 19 Fine adjustment set screw 20 Slider convex part 21 Slider concave part

Claims (1)

[Scope of utility model registration request] 1. A holder with a CCD, wherein a guide member is guided by a guided member of a base to move back and forth, and a slider provided with a fine adjustment cam (eccentric cam) is placed on the holder for fine adjustment. A back focus adjusting mechanism, wherein a slider is moved by rotating a cam for use, and the holder is moved back and forth while being guided by a guide member of a holder and a guided member of a base.