JPH083103Y2 - Back focus adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a back focus adjusting device for finely adjusting the back focus position of an objective lens from outside the device.

[Conventional technology]

In this type of back focus adjustment device, the third
As illustrated in the drawing, the fixed image pickup device 2 arranged at substantially the focal position of the objective lens 1 is moved in the optical axis direction of the objective lens 1 while being substantially perpendicular to the optical axis thereof, so that the parallel movement thereof is performed. As a means, two guide rods 3 are provided side by side. An elongated shaft 5 is rotatably provided on the back surface 4 of the camera device CA. This shaft 5
A threaded portion 6 is cut at the inner front end portion thereof by a length corresponding to the range of back focus adjustment. This thread 6
Is screwed with a part of the support member 7 that supports the fixed image pickup device (CCD) 2, so that the driver is installed in the driver hole 8 provided at the other end of the shaft 5 exposed to the outside of the camera device CA. The support member 7 can move along the optical axis if it is turned. Thereby, the back focus of the objective lens 1 can be adjusted within the range indicated by A.

[Problems to be solved by the device]

However, in such an adjusting device, there is an inconvenience that a tool called a driver must be used for each adjustment, and if the screwdriver is accidentally turned too much, the screwing may be disengaged, or the end of the screw portion 6 may be disconnected. There was a problem that it bites and causes damage.

[Means for solving the problem]

In order to solve the above problems, the present invention is directed to a guide means oriented parallel to the optical axis of the objective lens, and slidably attached to the guide means, and a solid-state image sensor (CCD) is attached to the objective lens. And a support member that supports the optical axis at a substantially focal position in a state substantially vertical to the optical axis,
In a back focus adjusting device capable of finely adjusting the back focus of the solid-state image pickup device from the outside of the device through the support member, one end is connected to the support member and the other end has a cam follower. An operation knob rotatable from the outside of the adjusting device, an intermediate gear rotated by the operation knob, a cam means attached to an eccentric position of the intermediate gear, and driving the cam driven means, and the operation described above. It is characterized in that the rod is provided with a spring that urges the spring along the optical axis direction.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2. Note that, in FIG. 1, the same or the same members as those described in FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

An operation knob 9 is rotatably provided on a part of the back surface 4 of the camera device CA. An eccentric cam 12 is provided on a gear (intermediate gear) 11 meshing with a gear 10 fixed to the shaft of the operation knob 9, and a cam follower member 13 formed in a U shape is engaged with the eccentric cam 12. I am fit. The driven member 13 is connected to an elongated operating rod 14, and the operating rod 14 is connected to a supporting member 7 of the solid-state image pickup device (CCD) 2.

According to the present invention having such a configuration, the position of the CCD can be finely adjusted by a simple operation of rotating the operation knob 9 without using any tool. Further, even if the operation knob 9 is turned too much, there is no danger of damaging any member. Further, in this invention, between the eccentric cam 12 and the driven member 13,
In consideration of a case where a gap may occur due to a manufacturing error or the like, a coil spring 15 is provided between the operating rod 14 and the camera device CA so that the gap can be absorbed, thereby enabling smooth fine adjustment. I have to. The coil spring 15
May be either a tension spring or a compression spring.

The cam means in the above-described embodiments can be realized by a cylindrical cam, for example.

[Effect of device]

As described above, according to the present invention, extremely smooth fine adjustment of the back focus can be achieved by simply operating the operation knob without using any tool. Further, there is an effect that there is no possibility of damaging any member even if it is rotated too much during the fine adjustment operation.

[Brief description of drawings]

1 and 2 are a schematic side view and a plan view showing an embodiment of the present invention, and FIG. 3 is a side view schematically showing a conventional back focus adjusting device. In the figure, 1 is an objective lens, 2 is a solid-state image sensor, 3 is a guide rod, 4 is a back surface, 5 is a shaft, 6 is a screw part, 7 is a support member, 8 is a driver hole, 9 is an operation knob, and 10 is a gear. , 11
Is a gear, 12 is an eccentric cam, 13 is a cam driven member, 14 is an operating rod, and 15 is a coil spring.

Claims (1)

[Scope of utility model registration request] 1. A guide means oriented parallel to an optical axis of an objective lens, and slidably attached to the guide means,
A support member for supporting the solid-state imaging device (CCD) in a state of being substantially perpendicular to the optical axis of the objective lens at a substantially focal position, and a backing of the solid-state imaging device via the support member. In a back focus adjusting device capable of finely adjusting the focus from the outside of the device, an operating rod having one end connected to the supporting member and a cam follower at the other end, and an operation rotatable from outside the adjusting device. A knob and an intermediate gear rotated by the operation knob,
A back focus, which is provided at an eccentric position of the intermediate gear and includes cam means for driving the cam driven means, and a spring for urging the operating rod along the optical axis direction. Adjustment device.