JP2795017B2 - Zoom lens barrel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens barrel having a variable focal length.

[0002]

2. Description of the Related Art In a camera having an AE function in which a macro operation is performed by a zoom lens or a zoom correction lens using a so-called 1-ring zoom lens, a focus operation, a zoom operation, and a macro operation are performed by one operation member. In order to perform AE more accurately, information on the focal length of the lens and information on whether or not macro shooting is required are required.

[0003]

However, in the above conventional example, detecting that the camera is in the macro shooting state is as follows.
Since the configuration of the zoom lens barrel becomes complicated, it has not been put to practical use.

An object of the present invention is to solve the above-mentioned problems and to obtain a zoom lens barrel capable of performing a zoom operation, a focus operation, and a macro operation with the same operation member and outputting a macro signal during the macro operation. With the goal.

[0005]

According to the present invention, there is provided a zoom lens barrel comprising: (1-1) a zoom lens barrel in which a zoom operation, a focus operation, and a macro operation are performed by the same operating member; The operation is performed by moving the member in the optical axis direction, the focus operation is performed by rotating the operation member, and the macro operation is performed by focusing the operation member in a state where the operation member is at a position corresponding to a wide end of zooming. Is performed by rotating from a rotation position corresponding to a close distance end to a macro area, and moves in the optical axis direction with movement of the operation member at the time of the zoom operation and at the time of the macro operation. A rectilinear cylinder that rotates with the rotation of the operation member is provided outside the fixed cylinder,
The fixed cylinder has a section pushed down by a wall portion of a groove formed in the rectilinear barrel which is rotated along with the rotation of the operation member to the macro area on the outer peripheral portion, and a pair of conductors which are made conductive by the pushed down section. A macro signal is formed by making the pair of conductor patterns conductive by the pushed-down section.

[0006]

1 to 5 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a zoom lens barrel that best illustrates the features of the present invention, and FIG. 2 is a zoom lens thereof. FIG. 3 is a perspective view of a macro detector of the zoom lens barrel, and FIGS. 4 and 5 are explanatory diagrams of a macro detector of the zoom lens barrel.

In FIGS. 1 to 5, 1a, 1b, 1
Reference numerals c and 1d denote lenses of a photographing optical system, 1a is a focus lens, 1b is a zoom variable power lens, 1c is a zoom correction lens, and 1d is a fixed lens.

Reference numeral 2 denotes an optical axis. Reference numeral 3 denotes a fixed portion (fixed tube) of a zoom lens barrel holding a fixed lens 1d. A cam groove 3a parallel to the optical axis 2 and a cam groove 3b for the zoom correction lens 1c. , A screw portion 3c, and a groove portion 3e for macro detection.
Reference numeral 4 denotes a focus lens barrel having a screw portion 4a screwed with the screw portion 3c. 5 is a holding barrel of the zoom lens 1b, 6 is a holding barrel of the zoom correction lens 1c,
It has a cam groove 6a having a lead.

Reference numeral 7 denotes an aperture unit, and 8 denotes a rectilinear cylinder having a screw portion 8a and a groove 8b parallel to the optical axis as shown in FIGS. An operation member 9 has a cam groove 9a parallel to the optical axis 2 and a screw portion 9b screwed with the screw portion 8a.
Reference numeral 10 denotes an outer cylinder, 11 denotes a lens mount, 12 denotes a roller for the zoom correction lens 1c which is implanted in the holding lens barrel 6, 13 denotes a focusing roller which is implanted in the focus lens barrel 4, and 14 denotes a straight moving cylinder. 8 is a roller for the zoom variable power lens 1b implanted on the inner diameter side of the zoom lens 8;

Reference numeral 15 denotes a rubber ring covering the operation member 9, and reference numeral 16 denotes a lens control circuit, which is connected to the diaphragm unit 7 by an electric signal line. Reference numeral 17 denotes a lens contact, which is connected to the lens control circuit 16 by an electric signal line. Reference numeral 18 denotes an electric board for macro detection, which is connected to the lens control circuit 16 by electric signal lines.

Reference numeral 19 denotes a metal macro-detecting section having a spring property, and reference numeral 20 denotes a macro-detecting section 19 for fixing the macro-detecting section 19.
Screw 30 is the camera body unit, 3
1 is a reflection mirror, 32 is a pentaprism, 33 is a camera control circuit, 34 is a camera contact, and the camera control circuit 3
3 and an electrical signal line, and is in contact with the lens contact 17. Reference numeral 35 denotes an imaging surface, 36 denotes a finder, and 37 denotes a power supply connected to the camera control circuit 33 by an electric signal line.

Next, the operation of the zoom lens barrel in the first embodiment will be described. First, a focus operation is performed by rotating the operation member 9 about the optical axis. When the operation member 9 rotates, the rollers 13 implanted in the focus lens barrel 4 are engaged with the cam grooves 9a, and the fixed part 3 and the focus lens barrel 4 are screwed together. 1a can be moved in the optical axis direction to perform focusing. At this time, the screw portions 8a, 9
Since the thread pitch of b is much smaller than that of the thread portions 3c and 4a, the operating member 9 moves only slightly in the optical axis direction.

In the case of a zoom operation, the operation member 9 is connected to the optical axis 2.
By moving in the direction of. When the operating member 9 moves straight in the optical axis direction, the rectilinear barrel 8 moves in the optical axis direction together with the operating member 9. Since the holding lens barrel 5 of the zoom lens 1b is held by the roller 14 implanted in the rectilinear barrel 8, and is engaged with the cam groove 3a of the fixed part 3 parallel to the optical axis 2,
The zoom variable power lens 1b moves in the optical axis direction together with the operation member.

At the same time, the cam groove 6a having the lead of the holding barrel 6 of the zoom correction lens 1c is engaged with the roller 14, and the roller 12 implanted in the holding barrel 6 is the cam of the fixed part 3. Since the roller 14 moves in the optical axis direction because it is engaged with the groove 3b, the zoom correction lens 1c moves in the optical axis direction while rotating.

A cam groove 3b is provided so that the zoom correction lens 1c is located at an appropriate position according to the position of the zoom variable power lens 1b. That is, the operating member 9
Is moved in the optical axis direction, the zoom variable power lens 1b and the zoom correction lens 1c move in the optical axis direction, and a zoom operation can be performed. At this time, the focus lens 1a does not move in the optical axis direction.

In the case of the macro operation, the operation member 9 is moved to the position closest to the subject, and the operation member 9 is further rotated from the state where the focus lens 1a is extended (at the wide angle end in this embodiment) and the focus lens 1a is extended most. Cam groove 3a of fixed part 3
Is formed as shown in FIG. 2, and the roller 14 can rotate about the optical axis 2 only at the wide-angle end. In other words, when the operation member 9 is further turned in the state where the focus lens 1a is extended most at the wide-angle end, the rectilinear ring 8
Rotates.

Then, the zoom variable power lens 1b does not move in the optical axis direction, but the holding lens barrel 6 rotates about the optical axis.
At the same time, it moves in the optical axis direction due to the relationship between the cam groove 3b and the cam groove 6a, and the macro operation can be performed. However, the macro lens intrusion direction that matches the rotation direction of the rectilinear barrel 8 and the focus lens 1
The cam groove 3a is configured so that the rotation direction of the operating member 9 for feeding out the a coincides. In addition, by a known means, the rectilinear barrel 8 is configured not to rotate during the focus operation.

Hereinafter, detection of a macro signal in the first embodiment will be described.

As shown in FIG. 2, the groove 3e of the fixing portion 3
An electric board 18 is adhered to the substrate, and thereafter the straight-moving cylinder 8 is covered as shown in FIG. Then, as shown in FIG. 4, the macro-detection section 19 is attached to the fixed part 3 by a screw 20. A part of the macro-detection section 19 protrudes. When the macro operation is performed, the straight-moving cylinder 8 rotates in the direction of the arrow in FIGS. 3 and 4 as described above.

Then, the piece 19 fixed in a state of floating above the electric board 18 becomes a groove 8 b of the rectilinear cylinder 8.
5 is pushed down by the wall surface portion 8c of the electric board 18 shown in FIGS.
18b. As a result, the pattern 18a,
18b is electrically connected and detected by the lens control circuit 16.

The lens contact 17 and the camera contact 34
Is transmitted to the camera control circuit 33 through the camera control circuit 33, and the camera control circuit 33 performs control during macro shooting. When escape from the macro area, the macro detection section 19 returns to the state shown in FIG. 4, and the connection between the patterns 18a and 18b is disconnected. This is transmitted by the lens control circuit 16 to the camera control circuit 33, and the control of the camera is returned to the normal shooting control.

6 to 8 show examples related to the present invention. FIG. 6 is a longitudinal sectional view of a zoom lens barrel, and FIGS. 7 and 8 are explanatory views of a macro detector of the zoom lens barrel. It is.

6 to 8, reference numerals 41a, 41
Reference numerals b, 41c, and 41d denote lenses of a photographing optical system.
a is a focus lens, 41b is a zoom variable power lens, 4
1c is a zoom correction lens, and 41d is a fixed lens.

Reference numeral 42 denotes an optical axis. Reference numeral 43 denotes a fixed portion of the zoom lens barrel holding the fixed lens 41d.
And a cam groove 43a, a screw portion 43b, and a macro detection groove portion 43c which are parallel to the cam groove 43a. Reference numeral 44 denotes a focus lens barrel having a screw portion 44a screwed with the screw portion 43b. 4
Reference numeral 5 denotes a holding barrel of the zoom lens 1b, and reference numeral 46 denotes a holding barrel of the zoom correction lens 1c.

Reference numeral 47 denotes an aperture unit, and 48 denotes a straight advancing cylinder, which includes a screw portion 48a, a cam groove 48b having a lead, and an optical axis 4.
It has a cam groove 48c that is parallel to 2. An operation member 49 includes a cam groove 49a parallel to the optical axis 42 and a screw portion 48a.
And a screw portion 49b to be screwed. 50 is an outer cylinder, 51
Denotes a lens mount, and 52 denotes a roller implanted in the holding barrel 45. 53 is a roller implanted in the holding barrel 46, 54
Is a roller implanted in the focus lens barrel 44.

Reference numeral 55 denotes a rubber ring covering the operation member 49, and reference numeral 56 denotes a lens control circuit, which is connected to the diaphragm unit 47 by an electric signal line. 57 is a lens contact,
It is connected to the lens control circuit 56 by an electric signal line. 58
Denotes an electric board for macro detection, and a lens control circuit 56
And an electric signal line.

Reference numeral 59 denotes a metal macro-detection section having a spring property, and reference numeral 60 denotes a macro-detection section 59 to which the fixing section 4 is attached.
A screw 61 fixed to 3 is a cam ring rotatably held by the fixing portion 43 and has cam grooves 61a and 61b. 62 is a roller implanted on the outer surface of the cam ring 61, 63
Is a roller implanted on the outer surface of the fixing portion 43.

In addition, since the structure of the camera body unit 30 is the same as that of the first embodiment, the same portions are denoted by the same reference numerals and the description thereof will not be repeated.

Next, the operation of the zoom lens barrel in this example will be described. First, in the case of focus operation,
This is performed by rotating the operation member 49 about the optical axis.
When the operation member 49 rotates, the focus lens barrel 44 is rotated.
The roller 54 is engaged with the cam groove 49a,
Since the fixed portion 43 and the focus lens barrel 44 are screwed together, the focus lens 41a can move in the optical axis direction to perform focusing. At this time, the screw portions 48a,
Since the thread pitch of 49b is much smaller than that of the threaded portions 43b and 44a, the operation member 49 moves only slightly in the optical axis direction.

The zoom operation is performed by moving the operation member 49 in the direction of the optical axis 42. When the operating member 49 moves straight in the optical axis direction, the straight advancing tube 48 moves in the optical axis direction together with the operating member 49 because the roller 63 implanted in the fixed portion 43 is engaged with the cam groove 48c. The roller 62 implanted in the cam ring 61 is provided with a cam groove 48 having a lead.
b, the cam ring 61 rotates.

The holding lens barrels 45 and 46 are provided with three rollers 52 and 53, respectively. The rollers 52 and 53 are a cam groove 43a parallel to the optical axis 42 and a cam groove for the cam ring 61 for zooming. The cam ring 61 is engaged with the cam ring 61a.
When rotates, the zoom variable power lens 41b and the zoom correction lens 41c perform zoom movement in the optical axis direction. That is, when the operation member 49 is moved in the optical axis direction, the zoom variable power lens 4 is moved.
The zoom operation can be performed by moving the zoom lens 1b and the zoom correction lens 41c in the optical axis direction. At this time, the focus lens 41a does not move in the optical axis direction.

In the case of a macro operation, the operation is performed by moving the operation member 49 to the camera side. The cam grooves 61a and 61b of the cam ring 61 include a zoom portion and a macro portion following the zoom portion. When the operating member 49 is moved toward the camera, the rectilinear barrel 48 moves in the optical axis direction, the cam ring 61 rotates, and the zoom operation described above is performed up to a certain point. Rollers 52 and 53 are cam grooves 61a and 6
Invading the macro part of 1b, the zoom variable power lens 41
The macro operation is performed by the macro movement of b and the zoom correction lens 41c.

Hereinafter, detection of a macro signal in the above example will be described. As shown in FIG.
An electric board 58 is attached to 3c, and a macro-detection section 59 is attached to the fixing portion 43 by a screw 60. The electric board 58 has patterns a and b, which are not shown but are not connected, similarly to the first embodiment.

When the macro operation is performed from this state, the rectilinear barrel 48 moves in the direction of the arrow in FIG. 7 as described above. Then, the contact piece 59 for macro detection, which has been fixed in a state of floating above the electric board 58, is pushed down by the rectilinear barrel 48 as shown in FIG. 8 and comes into contact with the patterns a, b (not shown) of the electric board 58. . Thus, the patterns a and b are electrically connected and detected by the lens control circuit 56. Then, the control signal is transmitted to the camera control circuit 33 via the lens contact 57 and the camera contact 34, and the camera control circuit controls macro shooting.

When the macro escapes from the macro area, the macro detection contact piece 59 returns to the state shown in FIG. 7, and the connection between the patterns a and b (not shown) is cut off. This is transmitted to the camera control circuit 33 by the lens control circuit 56, and the control of the camera is returned to the control of the normal photographing.

The macro detection in this embodiment is performed by detecting the movement of the rectilinear barrel 48 in the optical axis direction.
In this example, the rotation is performed by detecting the rotation of the rectilinear barrel 8. However, it is the same that the macro detection contact pieces 19 and 59 are set so that the macro detection can be performed at the same time when the zoom lens barrel enters the macro area.

[0037]

As described above, according to the present invention,
Since the movement of the zoom lens barrel component during macro shooting is detected, the zoom operation, the focus operation, and the macro operation are performed by the same operation unit. A signal can be output, and this macro signal has an effect that control at the time of macro shooting can be accurately performed on the camera side.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a zoom lens barrel showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a main part in the first embodiment.

FIG. 3 is a perspective view of a macro detector according to the first embodiment.

FIG. 4 is an explanatory diagram of an operation of a macro detector in the first embodiment.

FIG. 5 is an explanatory diagram of an operation of a macro detector in the first embodiment.

FIG. 6 is a longitudinal sectional view of a zoom lens barrel related to the present invention.

FIG. 7 is an explanatory diagram of the operation of the macro detector in FIG. 6;

FIG. 8 is an explanatory diagram of the operation of the macro detector in FIG. 6;

[Explanation of symbols]

 Reference Signs List 3 Fixing part 5 Holding lens barrel (zoom zoom lens moving ring) 6 Holding lens barrel (zoom correcting lens moving ring) 8 Zoom straight advance barrel 9 Operating member 18 Electric circuit board 19 Macro detection section 43 Fixing part 45 Holding lens barrel ( (Zoom zoom lens moving ring) 46 holding lens barrel (zoom correcting lens moving ring) 48 zoom straight moving barrel 49 operating member 91 cam ring

Claims (1)

(57) [Claims] 1. A zoom lens barrel in which a zoom operation, a focus operation, and a macro operation are performed by the same operation member, the zoom operation is performed by moving the operation member in an optical axis direction, and the focus operation is performed by the operation member. The macro operation is performed by rotating the operation member from a rotation position corresponding to a close distance end of focusing to a macro area in a state where the operation member is at a position corresponding to a wide end of zooming. A straight-moving cylinder that moves in the optical axis direction with the movement of the operation member during the zoom operation and that rotates with the rotation of the operation member during the macro operation is provided outside the fixed cylinder. The fixed cylinder has an outer peripheral portion formed by a wall portion of a groove formed in the rectilinear cylinder which rotates with rotation of the operation member to the macro area. And a pair of conductor patterns that are made conductive by the depressed section, and the pair of conductor patterns are made conductive by the depressed section to form a macro signal. Zoom lens barrel.