JPH0545625U - Cassegrain type telescope - Google Patents

Abstract

(57) [Summary] [Purpose] The focus of the secondary mirror is accurately and smoothly adjusted. A tip end portion 11 of a fine movement screw 10 connected to a motor 5 is attached to a fine movement screw receiving portion 9 of a secondary mirror disk 8 having a secondary mirror 4.
Is positioned at the center of the optical axis P of the motor, the motor 5 is fixed to the motor rotation stop plate 15, and the motor 5 is extended from the immovable body 17 into the through hole 16 formed in the motor rotation stop plate 15. The rod 18 was loosely fitted to the fine movement screw 10 so that the fine movement screw 10 could not be rubbed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a Cassegrain type telescope having a secondary mirror electric focusing device.

[0002]

[Prior Art]

 In the past, the motor was fixed to the immovable portion of the cylindrical body, and the secondary mirror disk having the secondary mirror was moved in the optical axis direction by rotation of the motor shaft.

[0003]

[Problems to be solved by the device]

 In the prior art, the motor is fixed to the immovable portion of the cylindrical body, the fine movement screw is attached to the motor shaft, and the four circumferences of the secondary mirror are pressed to move the secondary mirror in the optical axis direction. However, there is a drawback in that the fine adjustment screw causes a so-called rasping motion, which makes it difficult to achieve good focus adjustment.

[0004]

[Means for Solving the Problems]

 According to the present invention, the center of the fine movement screw receiving portion of the secondary mirror disc having the secondary mirror which is always urged in the predetermined direction by the spring is pressed and moved by the fine movement screw linked to the motor. It's done.

[0005]

[Action]

 The rotation of the motor causes the fine movement screw to overcome the acting force of the spring and push the secondary mirror in the optical axis direction for focusing.

[0006]

【Example】

 Next, the present invention will be described with reference to the drawings. Reference numeral 1 denotes a telescope lens barrel, which contains a main mirror 3 mounted on a main mirror cell 2 and a secondary mirror 4 which is moved by a motor 5 in the optical axis direction for focusing. .. 6 is an eyepiece lens. The secondary mirror 4 is attached to the secondary mirror disk 8 via the secondary mirror spread cork 7. Reference numeral 9 denotes a fine movement screw receiving portion of the secondary mirror disk 8 which is positioned on the optical axis P. Reference numeral 10 is a fine movement screw positioned on the optical axis P, and its tip 11 is brought into contact with the center of the fine movement screw receiving portion 9. Reference numeral 12 is a base end portion of the fine movement screw 10 and is attached to a rotary shaft 13 of the motor 5.

The above-mentioned motor 5 is attached to an L-shaped motor rotation stop plate 15 with a screw 14. Reference numeral 16 is a through hole formed in the motor rotation stop plate 15 into which a rod 18 extended from an immovable body 17 is loosely fitted, so that even if the motor 5 produces a razor movement, a slight movement occurs. It has a function of preventing the screw 10 from causing a rasping movement. That is, the rubbing movement of the motor 5 is caused to prevent the rubbing movement of only the fine movement screw 10.

Reference numeral 18 A denotes an embedded screw portion integrally formed with the non-moving body 17, and is meshed with the fine movement screw 10. Reference numeral 19 denotes a coil spring, which is formed by a moving sleeve 23 integrally formed with the recess 20 of the immovable body 17 and the secondary mirror disk 8 having the fine movement screw receiving portion 9 described above. And the auxiliary mirror disc 8 is always moved in the direction of the arrow A, and the fine movement screw receiving portion 9 is pressed against the front end portion 11 of the fine movement screw 10. I am doing it. Reference numeral 22 denotes a spring holding screw that locks one end of the coil spring 19.

Reference numeral 24 is a baffle sleeve, and 25 is an optical axis ring, which is connected to the above-mentioned moving sleeve 23 so as to move together with the secondary mirror disk 8 in the optical axis direction. Reference numeral 26 is a secondary mirror baffle attached to the stationary body 17, 27 is a motor cover, and 28 is a spider-like support plate to which the stationary body 17 is mounted. The support plate 28 is fixed to the telescope barrel 1.

Next, the operation mode of the present invention will be described. Now, when the motor 5 is rotated in a predetermined direction to perform focusing, the fine movement screw 10 is rotated along with the motor 5 in the arrow B direction while rotating, and the coil spring 19 is moved. While compressing, the tip portion 11 presses the fine movement screw receiving portion 9 of the secondary mirror disk 8 in the same direction and moves the secondary mirror 4 in the same direction to perform focus alignment. At this time, the motor 5 makes a rasping motion, but the fine rotation screw 10 does not cause a rasping motion and does not shake on the optical axis P due to the motor rotation stop plate 15, the through hole 16, the rod 18, etc. Focusing is accurately and smoothly performed at.

Further, when the motor 5 rotates in the opposite direction to the above, the fine movement screw 10 moves in the arrow C direction while rotating in the predetermined direction. At that time, due to the restoring force of the coil spring 19, the fine movement screw receiving portion 9 of the secondary mirror disc 8 follows in the same direction and always moves in pressure contact with the tip portion 11 of the fine movement screw 10. Also moves in the same direction to perform focus adjustment.

[0012]

[Effect of the device]

 According to the first aspect of the present invention, the fine movement screw linked to the motor presses the center of the optical axis of the fine movement screw receiving portion of the secondary mirror disc having the secondary mirror, so that accurate focus alignment can be achieved. Can go According to the second aspect of the present invention, the motor is fixed to the motor rotation stop plate, and the rod extending from the immovable body is loosely fitted in the through hole. Even if a rubbing movement occurs, the fine-motion screw does not cause a grinding movement, and focusing can be performed smoothly and accurately.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing the whole of the present invention.

FIG. 2 is an enlarged vertical sectional front view showing a main part of the present invention.

FIG. 3 is a perspective view of the motor of the present invention attached to a motor rotation stop plate.

[Explanation of symbols]

 4 Secondary Mirror 5 Motor 8 Secondary Mirror Disk 9 Fine Motion Screw Receptor 10 Fine Motion Screw 11 Tip 13 Rotation Axis 15 Motor Rotation Stop Plate 16 Through Hole 17 Immovable Body 19 Coil Spring P Optical Axis

Claims (2)

[Scope of utility model registration request] 1. A Cassegrain type telescope in which a tip portion 11 of a fine movement screw 10 connected to a motor 5 is positioned at the center of an optical axis P of a fine movement screw receiving portion 9 of a secondary mirror disc 8 having a secondary mirror 4. 2. A tip end portion 11 of a fine movement screw 10 connected to a motor 5 is positioned at the center of an optical axis P of a fine movement screw receiving portion 9 of a secondary mirror disk 8 having a secondary mirror 4, and at the same time, -Ta-
5 is fixed to the motor rotation stop plate 15, and a rod 18 extended from an immovable body 17 is loosely fitted in a through hole 16 formed in the motor rotation stop plate 15 to rub the fine movement screw 10. Cassegrain-type telescope characterized by being configured to prevent movement