JPH07311326A - Optical device - Google Patents

Abstract

PURPOSE:To obtain an optical device which is compact, whose number of parts is reduced and which is constituted so that operating physical force is varied by coupling the driven member of a brake for setting operating physical force to a rotating member constituting a lens operation part. CONSTITUTION:The rotating member 13b of a shaft 13a vertically provided on a sliding shaft 13 connected to an operation bar 12 operated from the outside of the device is engaged with a linear groove 17a provided on a rotary barrel 17 in parallel with the shaft 13. The rotating member 13c is engaged with the cylindrical barrel 4a provided on a sliding body 14. Then, the brake for setting operating physical force 21 generates control torque corresponding to the contact area of a brake belt with grease by the action of the grease applied on the surface of a counter balance case 8 serving also as a brake drum being the driven member of the brake. By such constitution, the operating physical force of zooming is changed by turning a knob for setting operating physical force 21f from the outside of a lens main body 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device capable of operating force.

[0002]

2. Description of the Related Art FIG. 5 is a longitudinal sectional view showing the structure of a conventional operating force variable optical device, and FIG. 6 is a lateral sectional view taken along the line C--C of FIG. This is a one-axis / two-operation zoom lens with variable zooming operation force.

In FIGS. 5 and 6, 1 is a focusing lens group for focusing, 2 is a zoom system variator lens group for zooming, 3 is a compensator lens group for correction of a zoom system, and 4 is an image forming relay lens group. The lens groups 1 to 4 are supported by the lens body 5.

A female screw 1a engaging with the male screw 6a of the helicoid 6 is provided at one end of the holding lens barrel of the focusing lens group 1, and a linear groove 5a provided in the lens body 5 at the other end.
A rotating member 1b that engages with is provided, and linear movement is performed in the optical axis direction by rotation of the helicoid 6.

Further, a zoom system variator lens group 2
And, at one end of the holding barrel of the compensator lens group 3, there are provided rotating members 2a and 3a which engage with cam grooves 7a and 7b provided on the cylindrical cam 7 based on an optical relationship.
Rotating members 2b and 3b engaging with a linear groove 5b provided in the lens body 5 are attached to the other end, and perform linear movement in the optical axis direction in accordance with the rotation of the cylindrical cam 7.

Further, the cylindrical cam 7 is interlocked with the counter balance case via a pulley 7c connected thereto, a belt 20 and a pulley 8a connected to the counter balance case 8. The counterbalance case 8 has a cam groove 9b provided in the counterbalance 9.
The counter balance 9 is provided with a rotating member 8a which engages with the linear groove 10a provided on the counter balance shaft 10. The counter balance 9 is rotated by the rotating member 8b. A linear movement is performed in the optical axis direction according to.

It should be noted that the cam groove 9b provided in the counter balance 9 has a gravity acting on the variator lens group 2 and the compensator lens group 3 of the zoom system and a gravity acting on the counter balance 9 when the whole lens is tilted. Has a cam shape that offsets.

Reference numeral 13 is a sliding shaft connected to an operating rod 12 operated from the outside of the apparatus, and a rotating member 13b, 13c is attached to a shaft 13a provided perpendicularly to the sliding shaft 13 for rotation. The member 13b is attached to the rotary cylinder 17 by the sliding shaft 13
To engage with the linear groove 17a provided in parallel with the rotary member 1
3c is engaged with a cylindrical groove 14a provided in the sliding body 14.

The sliding body 14 has an inner diameter that engages with the outer diameter of the rotary cylinder 17. Further, the sliding body 14 is engaged with the shaft 18 through the hole 14b to prevent rotation, and the wires 15 attached to both ends of the sliding body 14 change the direction of the pulley 16a,
It is fixed by a metal fitting 8d to a pulley 8c connected to the counter balance case 8 via 16b and 16c.
The linear movement of the sliding shaft 13 in the arrow direction is caused by the rotation member 13c.
Pulley 8c that is transmitted to the sliding body 14 through the wire and is connected to the counter balance case 8 through the wire 15.
To drive. Further, the rotary motion of the sliding shaft 13 is controlled by the rotary member 1.
Belt pulley 1 provided on the rotary cylinder 17 via 3b
The belt pulley 6 is driven by the belt 19 after being transmitted to 7b.

With the above configuration, in the one-axis / two-operation zoom lens, zooming is performed by pushing (Tele) and pulling (Wide) the grip 12a provided at one end of the operating rod 12, and clockwise (infinity) and counterclockwise (closest). ) Focusing is controlled by rotation.

On the other hand, the linear motion of the sliding shaft 13 is transmitted to the sliding body 14 via the rotating member 13c, and the wire 22
Pulley 2 coupled to brake drum 21a via
Drive 4 23a, 23b and 23c are wires 22
It is a pulley for changing the direction of.

As shown in FIG. 6, when the brake drum 21a rotates, the operating force setting brake 21 has a contact area between the brake belt 21c and the grease 21b due to the action of the grease 21b applied to the surface of the brake drum 21a. Generates the corresponding braking torque.

A gear 21e that is coupled to the operating force setting knob 21f by a shaft and meshes with a gear engraved on the outer periphery of the spacer 21d is interlocked with the rotational movement of the operating force setting knob 21f so that the spacer 21d is moved to the brake drum 2.
Move around the center of 1a. Depending on the position of the spacer 21d, the spring 21g causes the brake drum 21a to move.
The contact area between the brake belt 21c and the grease 21b is changed by pulling apart a part of the brake belt 21c held so as to be in close contact with the brake drum 21a. With this configuration, the operating force for zooming can be changed by turning the operating force setting knob 21f from outside the lens body 5.

[0014]

Since the conventional optical device is constructed as described above, the lens body requires a space to be large in size in order to incorporate a mechanism for varying the operating force, and the number of parts is large. There was a problem in that In particular, in a one-axis two-operation zoom lens, when the operating force is variable by using a brake that acts on the rotational movement, the zooming operation is performed in a linear movement.
There is a problem that a mechanism for converting linear motion into rotary motion is required.

The inventions set forth in claims 1 to 4 have been made in order to solve the above-mentioned conventional problems, and an object thereof is to obtain an optical device having a small operating force and a small number of parts. .

[0016]

According to another aspect of the present invention, there is provided an optical device, wherein a driven member of an operating force setting brake is connected to a rotating member which constitutes a lens operating portion.
The operation force can be made variable with a small size and a small number of parts.

In the optical device according to the second aspect of the present invention, the same effect as that of the first aspect of the invention can be obtained by sharing the driven member of the operating force setting brake with the rotating member constituting the lens operating portion. To be

In the optical device according to the third aspect of the invention, the same effect as that of the first aspect of the invention can be obtained by sharing the driven member of the operating force setting brake with the counter balance cover.

In the optical device according to the fourth aspect of the present invention, the same effect as that of the first aspect of the invention can be obtained by sharing the driven member of the operating force setting brake with the cylindrical cam.

[0020]

【Example】

Example 1. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of an optical device that best represents the features of the present invention, and FIG. 2 is a horizontal cross-sectional view taken along the line AA of FIG.

In FIGS. 1 and 2, 1 is a focusing lens group for focusing, 2 is a zoom system variator lens group for zooming, 3 is a compensator lens group for zoom system correction, and 4 is an image forming relay lens group. The lens groups 1 to 4 are supported by the lens body 5.

A female screw 1a which engages with the male screw 6a of the helicoid 6 is provided at one end of the holding lens barrel of the focusing lens group 1, and a linear groove 5a provided in the lens body 5 is provided at the other end.
A rotating member 1b that engages with is provided, and linear movement is performed in the optical axis direction by rotation of the helicoid 6.

Further, a zoom system variator lens group 2
And, at one end of the holding barrel of the compensator lens group 3, there are provided rotating members 2a and 3a which engage with cam grooves 7a and 7b provided on the cylindrical cam 7 based on an optical relationship.
Rotating members 2b and 3b engaging with a linear groove 5b provided in the lens body 5 are attached to the other end, and perform linear movement in the optical axis direction in accordance with the rotation of the cylindrical cam 7.

The cylindrical cam 7 is interlocked with the counter balance case via a pulley 7c connected thereto, a belt 20 and a pulley 8a connected with the counter balance case 8. The counterbalance case 8 has a cam groove 9b provided in the counterbalance 9.
The counter balance 9 is provided with a rotating member 8a which engages with the linear groove 10a provided on the counter balance shaft 10. The counter balance 9 is rotated by the rotating member 8b. A linear movement is performed in the optical axis direction according to.

It should be noted that the cam groove 9b provided in the counter balance 9 has a gravity acting on the variator lens group 2 and the compensator lens group 3 of the zoom system and a gravity acting on the counter balance 9 when the entire lens is tilted. Has a cam shape that offsets.

Reference numeral 13 is a sliding shaft connected to an operating rod 12 which is operated from the outside of the apparatus. A rotary member 13b, 13c is attached to a shaft 13a provided perpendicularly to the sliding shaft 13 for rotation. The member 13b is attached to the rotary cylinder 17 by the sliding shaft 13
To engage with the linear groove 17a provided in parallel with the rotary member 1
3c is engaged with a cylindrical groove 14a provided in the sliding body 14.

The sliding body 14 has an inner diameter that engages with the outer diameter of the rotary cylinder 17. Further, the sliding body 14 is engaged with the shaft 18 through the hole 14b to prevent rotation, and the wires 15 attached to both ends of the sliding body 16a change the direction.
It is fixed by a metal fitting 8d to a pulley 8c connected to the counter balance case 8 via 6b and 16c. The linear movement of the sliding shaft 13 in the direction of the arrow is transmitted to the sliding body 14 via the rotating member 13c, and drives the pulley 8c coupled to the counter balance case 8 via the wire 15. In addition, the rotational movement of the sliding shaft 13 is caused by the rotation member 13
a belt pulley 17 provided on the rotary cylinder 17 via b.
The belt pulley 6b is driven by the belt 19 after being transmitted to b.

With the above-described structure, in the one-axis / two-operation zoom lens, zooming is performed by pushing (Tele) and pulling (Wide) the grip 12a provided at one end of the operating rod 12, and clockwise (infinity) and counterclockwise (closest). ) Focusing is controlled by rotation.

As shown in FIG. 2, the operating force setting brake 21 includes a counter balance case 8 which also serves as a brake drum, which is a driven member of the brake, by the action of grease 21b applied to the surface of the counter balance case 8. , Generates a control torque according to the contact area between the brake belt 21c and the grease 21b.

Then, the operating force setting knob 21f and the shaft 21
The operating force setting knob 21f is connected by a gear 21e that is engaged with the gear engraved on the outer periphery of the spacer 21d and connected by h.
The spacer 21d moves around the center of the counter balance case 8 in conjunction with the rotational movement of the counter balance case 8. This spacer 21
At the position d, a part of the brake belt 21c held by the spring 21g so as to be in close contact with the counter balance case 8 also serving as a brake drum is separated from the counter balance case 8, so that the brake belt 21c and the grease 21b come into contact with each other. The area changes.

With this structure, the operating force for zooming can be changed by turning the operating force setting knob 21f from outside the lens body 5.

Incidentally, the member shared with the driven member of the brake is not limited to the counterbalance cover case 8 as long as it is a rotating member constituting the lens operating portion, but it is also a cylindrical cam, a rotating cylinder and belt pulleys 6b, 7c, 8a and. The pulleys 16a, 16b, 16c and the helicoid 6 may be used. Although not shown in FIGS. 1 and 2, elements such as gears and shafts may be used.

In the first embodiment, the operating force for zooming is variable, but a configuration in which the operating force for focusing and iris operations is variable can be easily realized.

Example 2. 3 is a vertical cross-sectional view of an optical device showing Embodiment 2 of the present invention, and FIG. 4 is a horizontal cross-sectional view taken along the line BB of FIG. 3, and the same parts as those in FIGS. The duplicate description is omitted.

3 and 4, the operating force setting brake 21 has a grease drum 21a which is a driven member connected to the rotary cylinder 17 and whose surface is coated with a brake drum 21a.
By the action of b, the brake belt 21c and the grease 21b
The braking torque is generated according to the contact area of. Then, the operating force setting knob 21f is connected to the spacer 21d by a shaft.
By the gear 21e that meshes with the gear carved on the outer periphery of
The spacer 21d moves around the center of the brake drum 21a in conjunction with the rotational movement of the operating force setting knob 21f. Depending on the position of the spacer 21d, the brake belt 2
When a part of 1c is pulled away from the brake drum 21a, the contact area between the brake belt 21c and the grease 21b changes. With this configuration, the operating force for focusing can be changed by rotating the operating force setting knob 21f from outside the lens body 5.

The member to be coupled to the driven member of the brake is not limited to the rotary cylinder as long as it is a rotary member constituting the lens operating portion, and the cylindrical cam and belt pulleys 6b and 7c,
8a, pulleys 16a, 16b, 16c, and helicoid 6 may be used. Although not shown in FIGS. 3 and 4, elements such as gears and shafts may be used.

In the second embodiment, the focusing operation force is variable, but a configuration in which the zooming and iris operation forces are variable can be easily realized.

Further, in the first and second embodiments, the one-axis / two-operation zoom lens is used as an example of the optical device, but other operation type lenses may be used.

[0039]

As described above, according to the first aspect of the present invention, the driven member of the operating force setting brake is combined with the rotating member that constitutes the lens operating portion, and the invention according to the second aspect is provided. According to the invention of claim 3, the driven member of the operating force setting brake is shared with the rotating member, and the driven member of the operating force setting brake is a counterbalance case as the rotating member. According to the invention of claim 4, since the driven member of the operating force setting brake is also used as the cylindrical cam as the rotating member, the operating force can be varied and the operating force can be varied. There is an effect that an optical device can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an optical device according to a first embodiment of the present invention.

2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a longitudinal sectional view of an optical device showing a second embodiment of the present invention.

FIG. 4 is a cross-sectional view taken along the line BB of FIG.

FIG. 5 is a vertical cross-sectional view showing a conventional optical device.

6 is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

 7 Cylindrical cam 8 Counter balance case 17 Rotating member 21 Brake for operating force setting

Claims (4)

[Claims] 1. An optical device in which an operating force is variable,
An optical device characterized in that a driven member of an operating force setting brake is connected to a rotating member constituting a lens operating portion. 2. The optical device according to claim 1, wherein the driven member of the operating force setting brake is also used as a rotating member that constitutes a lens operating portion. 3. The optical device according to claim 1, wherein the driven member of the operating force setting brake is also used as a counter balance case. 4. The optical device according to claim 1, wherein the driven member of the operating force setting brake is also used as a cylindrical cam.