JP3097456B2 - Optical device - Google Patents

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 configuration of a conventional variable operating force optical device, FIG. 6 is a transverse sectional view taken along the line CC of FIG. 5, and the optical device of FIGS. This is a one-axis two-operation zoom lens having a variable zooming operation force.

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

[0004] At one end of the holding lens barrel of the focusing lens group 1, a female screw 1a engaging with the male screw 6a of the helicoid 6 is provided, and at the other end a straight groove 5a provided in the lens body 5.
And a rotating member 1b that engages with the rotating member 1 and performs linear motion in the optical axis direction by rotation of the helicoid 6.

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

The cylindrical cam 7 is linked to the counterbalance case via a pulley 7c, a belt 20, and a pulley 8a connected to the counterbalance case 8. The counterbalance case 8 includes a cam groove 9 b provided in the counterbalance 9.
The counterbalance 9 is provided with a rotary member 9a which engages with a linear groove 10a provided on the counterbalance shaft 10, and the counterbalance 9 is provided with a rotation of the counterbalance case 8. Linear motion in the direction of the optical axis.

The cam grooves 9b provided in the counter balance 9 are provided with 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. Have a cam shape that cancels out.

Reference numeral 13 denotes a sliding shaft connected to an operating rod 12 operated from the outside of the apparatus. Rotating members 13b and 13c are attached to a shaft 13a provided perpendicularly to the sliding shaft 13, and The member 13b is attached to the rotating cylinder 17 by the sliding shaft 13
Is engaged with the linear groove 17a provided in parallel with
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 by a hole 14b to prevent rotation, and wires 15 attached to both ends thereof have pulleys 16a for changing directions,
It is fixed to a pulley 8c connected to the counterbalance case 8 via 16b and 16c with a fitting 8d.
The linear motion of the sliding shaft 13 in the direction of the arrow is a rotation member 13c.
Pulley 8c which is transmitted to the sliding body 14 via a wire and is connected to the counterbalance case 8 via a wire 15.
Drive. In addition, the rotational motion of the sliding shaft 13 is
Belt pulley 1 provided on rotating cylinder 17 via 3b
The belt pulley 6b is driven by the belt 19 transmitted to the belt pulley 7b.

With the above-described configuration, in the one-axis two-operation zoom lens, zooming is performed by pushing (Tele) or pulling (Wide) the grip 12a provided at one end of the operation rod 12 to rotate clockwise (infinity) and counterclockwise (close). ) Focusing is operated 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,
Pulley 2 coupled to brake drum 21a via
4 is driven. 23a, 23b and 23c are wires 22
It is a pulley for changing the direction of the vehicle.

As shown in FIG. 6, when the brake drum 21a rotates, the grease 21b applied to the surface of the brake drum 21a causes the operation force setting brake 21 to reduce the contact area between the brake belt 21c and the grease 21b. A corresponding braking torque is generated.

The spacer 21d is connected to the operating force setting knob 21f by a shaft and meshes with a gear engraved on the outer periphery of the spacer 21d.
It moves around the center of 1a. According to the position of this spacer 21d, the brake drum 21a is
The contact area between the brake belt 21c and the grease 21b changes when a part of the brake belt 21c held in close contact with the brake belt 21c is separated from 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 needs a large space in order to incorporate a mechanism for varying the operation force, and the lens body has a large number of parts. However, there is a problem that the number increases. In particular, in a one-axis two-operation zoom lens, when the operation force is made variable using a brake acting on the rotational movement, the zooming operation is performed by a linear movement.
There is a problem that a mechanism for converting a linear motion into a rotary motion is required.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and has as its object to provide a small and variable operating force optical device having a small number of parts.

[0016]

According to a first aspect of the present invention, there is provided an optical apparatus comprising a driven member which is rotated by at least one of one axis and two operations of an operation rod capable of one axis and two operations. An optical device for driving a lens, wherein a brake belt is provided on the surface of the driven member via grease, and a contact area between the brake belt and grease is changed to change an operation force of the operation rod. It is characterized by having.

According to a second aspect of the present invention, in the first aspect of the present invention, the driven member is rotated by the push / pull operation of the operating rod, and zooming is performed.

According to a third aspect of the present invention, in the first aspect of the invention, focusing is performed by rotating the operation rod.

An optical device according to a fourth aspect of the present invention is an optical device which is rotated by at least one of one-axis and two-operation of an operation rod capable of two-axis operation, and which drives a lens by rotation of a driven member. Wherein a brake belt is provided on the surface of the driven member, and the operating force of the operating rod is changed using the brake belt. According to a fifth aspect of the present invention, in the fourth aspect of the present invention, a spacer is provided between the driven member and the brake belt, and an operation force setting knob for changing the position of the spacer is provided. It is characterized in that the operating force of the rod is changed.

[0020]

【Example】

Embodiment 1 FIG. Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of an optical device that best illustrates the features of the present invention, and FIG. 2 is a transverse sectional view taken along line AA of FIG.

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

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

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

The cylindrical cam 7 is linked to the counterbalance case via a pulley 7c, a belt 20, and a pulley 8a connected to the counterbalance case 8. The counterbalance case 8 includes a cam groove 9 b provided in the counterbalance 9.
The counterbalance 9 is provided with a rotary member 9a which engages with a linear groove 10a provided on the counterbalance shaft 10, and the counterbalance 9 is provided with a rotation of the counterbalance case 8. Linear motion in the direction of the optical axis.

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. Have a cam shape that cancels out.

Reference numeral 13 denotes a sliding shaft connected to an operating rod 12 operated from the outside of the apparatus. Rotating members 13b and 13c are mounted on a shaft 13a provided perpendicular to the sliding shaft 13. The member 13b is attached to the rotating cylinder 17 by the sliding shaft 13
Is engaged with the linear groove 17a provided in parallel with
3c is engaged with a cylindrical groove 14a provided in the sliding body 14.

The sliding body 14 has an inner diameter which engages with the outer diameter of the rotary cylinder 17. The sliding body 14 is engaged with a shaft 18 at a hole 14b to prevent rotation, and wires 15 attached to both ends of the sliding body 14 change the direction of pulleys 16a, 1b.
It is fixed to a pulley 8c connected to the counterbalance case 8 via 6b and 16c with a fitting 8d. The linear motion 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 connected to the counterbalance case 8 via the wire 15. Further, the rotational movement of the sliding shaft 13 is
a belt pulley 17 provided on the rotary cylinder 17 through the b
and the belt 19 drives the belt pulley 6b.

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

As shown in FIG. 2, the brake 21 for operating force setting is such that the counterbalance case 8 also serving as a brake drum, which is a driven member of the brake, is operated by the grease 21b applied to the surface of the counterbalance case 8. And a control torque corresponding to the contact area between the brake belt 21c and the grease 21b.

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

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.

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 section. The cylindrical cam, the rotating cylinder and the 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 zooming operation force is variable, but a configuration in which the focusing and iris operation forces are variable can be easily realized.

Embodiment 2 FIG. FIG. 3 is a longitudinal sectional view of an optical device showing a second embodiment of the present invention, and FIG. 4 is a transverse sectional view taken along the line BB of FIG. 3. In FIG. And duplicate explanations are omitted.

In FIGS. 3 and 4, the brake 21 for operating force setting is composed of a grease 21 coated on the surface of a brake drum 21a which is a driven member connected to the rotary cylinder 17.
b, the brake belt 21c and the grease 21b
Generates a braking torque corresponding to the contact area of. The spacer 21d is connected to the operating force setting knob 21f by an axis.
The gear 21e that meshes with the gear engraved on the outer circumference 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. According to the position of the spacer 21d, the brake belt 2
When a part of 1c is separated 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 turning the operating force setting knob 21f from outside the lens body 5.

The member to be connected to the driven member of the brake is not limited to a rotary cylinder as long as it is a rotary member constituting a lens operating section. The cylindrical cam and the belt pulleys 6b, 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 operating force for focusing is variable. However, a configuration in which the operating force for zooming and iris operation is variable can be easily realized.

In the first and second embodiments, a one-axis two-operation zoom lens is used as an example of the optical device. However, a lens of another operation method 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 connected to the rotating member constituting the lens operating section. For example, the driven member of the operating force setting brake is shared with the rotating member. According to the invention of claim 3, the driven member of the operating force setting brake is a counterbalance case as the rotating member. According to the fourth aspect of the present invention, since the driven member of the operating force setting brake is shared with the cylindrical cam as the rotating member, the operating force can be reduced with a small number of parts and a small number of parts. There is an effect that an optical device can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a transverse sectional view taken along the line AA of FIG. 1;

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

FIG. 4 is a transverse sectional view taken along the line BB of FIG. 3;

FIG. 5 is a longitudinal sectional view showing a conventional optical device.

FIG. 6 is a transverse sectional view taken along the line CC of FIG. 5;

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-88067 (JP, A) JP-A-6-130266 (JP, A) JP-A-4-93808 (JP, A) JP-A-61- 267012 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G02B ^7/ 02-7/10

Claims (5)

(57) [Claims] 1. One-axis two-operation operation rod capable of one-axis two-operation
Driven by at least one of the following operations
An optical device that drives a lens by rotating a moving member.
Grease the brake belt on the surface of the driven member.
The contact area between the brake belt and grease
That the operating force of the operating rod is changed.
Characteristic optical device. 2. The push-pull operation of the operating rod causes the push-pull operation of the operating rod.
It is noted that the driven member is rotated and zooming is performed.
The optical device according to claim 1, wherein 3. A fork by rotating the operating rod.
2. The optical device according to claim 1, wherein casing is performed.
Place. 4. One-axis two-operation operation rod capable of one-axis two-operation
Driven by at least one of the following operations
An optical device that drives a lens by rotating a moving member.
Thus, a brake belt is provided on the surface of the driven member,
Use the brake belt to change the operating force of the operating rod.
An optical device, comprising: (5) The driven member and the brake belt
Spacers are provided between them, and the positions of the spacers are changed.
An operating force setting knob is provided.
Claims characterized in that the operating force of the operating rod is changed
Item 6. The optical device according to Item 4.