JPH0763977A - Zoom lens device - Google Patents

Abstract

PURPOSE:To easily assemble a guide bar by press-fitting both ends of the guide bar for guiding a photographing lens frame so that it may move back and forth inside a case in through holes formed at the front and rear ends of the case and supporting the guide bar in the case. CONSTITUTION:The rear ends of the guide bars 64 to 72 are press-fitted and fixed in the through holes 140 to 148 formed on the back wall part of the case 18, and the front ends thereof are press-fitted and fixed to the through holes 130 to 138 formed on a fixed frame 22. Thus, the guide bars 64 to 72 are hardly tilted. Since the guide bars 64 to 72 are press-fitted to the through holes 130 to 138 while viewing the front ends of the guide bars 64 to 72 from the through holes 130 to 138 of the fixed frame 22, they are easily assembled in the case 18 even when many guide bars are assembled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens device, and more particularly to a compact camera or a simplified camera-integrated VT.
The present invention relates to a zoom lens device applied to R.

[0002]

2. Description of the Related Art In a zoom lens device, a plurality of photographing lens frames holding a photographing lens are guided by a plurality of guide rods arranged in a case and moved back and forth along the photographing optical axis in the case. Performs zooming by The guide rod is first positioned by inserting its rear end into a recess formed in the rear end of the case and guiding the photographing lens frames by the guide rods, respectively, and then fixed to the front end of the case. It is supported by the case by inserting the front end of the guide rod into the recess formed in the body.

[0003]

However, the conventional zoom lens device has a drawback in that the guide rod is prone to fall down after the front end portion of the guide rod is inserted into the concave portion formed in the frame, and it takes a lot of time to assemble the guide rod. is there. Further, in the conventional zoom lens device, since it is not possible to assemble the front end portion of the guide rod and the recessed portion of the frame while observing with the naked eye, there is a drawback that it takes time to assemble when the number of guide rods is large.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a zoom lens device in which a guide rod can be easily assembled.

[0005]

In order to achieve the above-mentioned object, the present invention guides a plurality of photographing lens frames holding a photographing lens by a plurality of guide rods arranged in a case. In a zoom lens device that performs zooming by moving back and forth along a shooting optical axis in a case, the plurality of guide bars have both ends thereof at a front end of the case,
Further, it is characterized in that it is pressed into a through hole formed at the rear end and supported by the case.

[0006]

According to the present invention, since the rear end portion of the guide rod is press-fitted and fixed in the through hole formed at the rear end of the case, the guide rod is hard to fall down. Further, according to the present invention, the guide rod can be press-fitted through the through hole formed at the front end of the case while looking at the front end portion of the guide rod, so that the guide rod can be easily assembled even when the number of guide rods is large. be able to.

Further, according to the present invention, since the tapered guide surface is formed at the entrance of the through hole, the end portion of the guide rod is guided to the through hole by this guide surface. Therefore, the guide rod can be easily assembled.

[0008]

The preferred embodiments of the zoom lens device according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a camera-integrated VT to which a zoom lens device according to the present invention is applied.
It is a perspective view showing the appearance of R10. This camera integrated V
The TR 10 is composed of a camera section 12 and a VTR deck section 14, and the camera section 12 includes a zoom lens device 16
The VTR deck 14 is provided with a video cassette tape loading device and the like.

FIG. 2 is a perspective view showing the outline of the camera unit 12 excluding the outer case, and FIG. 3 is a front view of the zoom lens device 16 and the finder unit 200 taken along line 3-3 in FIG. 4 is a sectional view taken along line 4-4 in FIG. 5 and 6 are exploded perspective views of the front half and the rear half of the zoom lens device 16. The zoom lens device 16 and the finder unit 200 are arranged in parallel in the case 18 shown in FIGS. 2 and 3, and the zoom lens device 16 includes the front frame 20, the fixed frame 22, and the first frame as shown in FIGS. The movable frame 24, the iris unit 26, and the second movable frame 28 are main components. Case 1 compatible with the zoom lens device 16
A CCD unit 30 is attached to the rear of the unit 8. A side cam barrel 32, which will be described later, is arranged in parallel with the photographing optical axis 34 on the side of the zoom lens optical system of the case 18.

As shown in FIG. 5, a protective glass 36 is attached to the opening 20A of the front frame 20, and the front frame 20 has a claw portion 38 formed on the upper portion thereof for the first moving frame 24. By being locked in the hole 40 of the first moving frame 24
Fixed to. The fixed frame 22 is a front edge 1 of the case 18.
9 is fixed by screws 42, 42. On the other hand, three taking lenses 44, 46, and 48 are fixed to the first moving frame 24 via a lens frame 50. The iris unit 26 is fixed to the front side of the second moving frame 28 with screws 52, 52, and the iris meter 27 of the iris unit 26 is inserted into the opening 27A of the second moving frame 28.

Further, three lenses 54, 56 and 58 are attached to the second moving frame 28 via a spacing ring 60 and a stopper ring 62. In the case 18, five guide rods 64, 66, 68, 7 are arranged in parallel with the photographing optical axis 34.
0 and 72 are provided. These guide rods 64 to 72
As shown in FIG. 5, the front end of each of them is press-fitted and fixed in each of the through holes 130, 132, 134, 136, 138 formed in the fixing frame 22, and the rear end thereof is shown in FIG. Through holes 140, 1 formed in the rear wall of the
42, 144, 146, 148 are press-fitted and fixed. Further, at the entrance of the through holes 130 to 138,
Each tapered surface 150 is formed. As a result, the front ends of the guide rods 64 to 72 are guided by the tapered surface 150 and press-fitted into the through holes 130 to 138.

The first moving frame 24, as shown in FIG.
The guide rod 6 is inserted in the guide holes 74, 74 formed in the upper portion thereof.
6 is inserted, and the guide rod 72 is inserted into the steady rest groove 76.
Is positioned so that it can be moved back and forth while being guided by the guide rods 66 and 72. Further, the guide rod 68 is inserted into the guide hole 82 of the connecting piece 80, which will be described later, and the guide rod 64 is positioned in the steady rest groove 84 of the connecting piece 80.

As shown in FIGS. 5 and 6, the second moving frame 28 has a pair of guide holes 88, 88 formed in a guide rod 64.
When the guide rod 72 is inserted and the guide rod 72 is positioned in the steady rest groove 90, it is guided by the guide rods 64 and 72 and can be moved back and forth. On the other hand, the side cam barrel 32 shown in FIG. 6 includes the first moving frame 24 and the second moving frame 2.
It is arranged at the side of 8. Inside the side cam barrel 32,
The shaft 92 is inserted and fixed. A front end 94 of the shaft 92 is pivotally supported in a hole 96 of the fixed frame 22 as shown in FIG. 5, and a rear end 98 thereof is shown in FIG.
It is rotatable by being pivotally supported by the hole 100 of No. 8.

A gear 110 is formed integrally with the shaft 92, and the gear 110 meshes with a gear 114 of a motor 112, which will be described later. Therefore, the side cam barrel 32 is rotated by transmitting the driving force from the motor 112 via the gears 114 and 110. As shown in FIG. 6, four cam grooves 116, 118, 12 are provided on the outer peripheral surface of the side cam barrel 32.
0, 122 are formed. A cam 124 is formed at the rear edge of the side cam barrel 32, and the cam 124 is engaged with an end 128 of a display plate 126 (see FIG. 3) described later.

The cam 116 has a connecting piece 80 shown in FIG.
Driven pin 130 is inserted. The connection piece 80 is
The upper end 80 </ b> A of the connecting piece 80 is connected to the projecting piece 25 fixed to the first moving frame 24 via the extension spring 86, and the upper end 80 </ b> A of the connecting piece 80 is moved by the urging force of the extension spring 86.
Is pressed against the front side portion 78 of the. As a result, the first moving frame 24 moves the optical axis 34 by the urging force of the tension spring 86.
Is urged toward the front of. In addition, the tension spring 8
No. 6 has a spring force that allows the first moving frame 24 to escape to the camera rear side with respect to the connecting piece 80 when an external force is applied to the first moving frame 24.

A driven pin 132 of the second moving frame 28 shown in FIG. 6 is fitted into the cam 118. Therefore, when the side cam barrel 32 is rotated, the first moving frame 24 and the second moving frame 28 move toward each other along the cams 116 and 118 on the photographing optical axis 34 (tele side direction) and away from each other (telephoto side direction). It is possible to move back and forth in the wide side direction). As a result, the photographing magnification of the subject image can be changed.

As shown in FIGS. 2 and 8, the finder section 20 is used.
The finder body 202 of No. 0 is fixed to the side opening 206 (see FIG. 6) of the case 18 by screws 204, 204. Further, the finder body 202 holds a fixed frame 208, a front moving frame 210, a rear moving frame 212, a display plate 126, and a plurality of prisms described later. A guide plate 214 is formed on the finder body 202 so as to project forward, and the front moving frame 210 and the rear moving frame 212 are disposed on the finder optical axis 216 on the guide plate 214. In addition, the front moving frame 210 and the rear moving frame 212
Is a straight groove 222 in which guide pins 218 and 220 fixed to the side surface thereof are opened in the side surface of the guide plate 214.
It is possible to move back and forth along the straight groove 222 by being fitted to.

The front moving frame 210 has a variable power lens 224.
Further, three correction lenses 226, 228 and 230 are attached to the rear moving frame 212. The lens 228 has a rectangular surface, and two spacing pins 232, 232 ... Are integrally formed with the lens 228 at the corners thereof. These pins 232, 2
32 are correction lenses 226, 22 on the rear moving frame 212.
When the 8 and 230 are assembled, they come into contact with the corners of the lenses 226 and 230 to serve as a spacing ring.

Further, the front moving frame 210 and the rear moving frame 21
The driven pins 234 and 236 of the second are the side cam barrels 32.
It is fitted in the cam grooves 120 and 122 formed in the.
As a result, the front moving frame 210 and the rear moving frame 212 are rotated by rotating the side cam barrel 32.
It moves back and forth along the cam grooves 120 and 122 on the image pickup unit 16, and forms a subject image of approximately the same magnification as the subject image scaled by the first moving frame 24 and the second moving frame 28 on the eyepiece.

On the other hand, the display plate 126 is fixed to the guide rod 238 and arranged behind the rear moving frame 212. The guide rod 238 is pivotally supported on the finder body 202. As a result, the display plate 126 is rotatable together with the guide rod 238. In addition, the fixed frame 208 includes the screw 2
It is fixed to the front surface of the guide plate 214 by 40 and 240.

On the other hand, a rear side of the rear moving frame 212 is provided with a first prism 242 as shown in FIG.
The prism 242 is stored in a prism frame 243. As a result, the light incident from the front surface of the first prism 242 is refracted by 90 ° by the first prism 242 and is emitted upward. A field frame 244 is provided at a position where the emitted light forms an image.

A second prism 246 is provided above the field frame 244, and the second prism 246 is housed in the prism frame 248. As a result, the light incident from the bottom surface of the second prism 246 is not reflected by the second prism 4
The light is refracted by 90 ° by 62 and emitted toward the rear eyepiece. Behind the second prism 246, the spacer 2
50 is provided, and the light refracted by the second prism 250 is transmitted through the spacer 250 to the eyepiece 25 shown in FIG.
It is emitted toward 2.

Next, the operation of the zoom lens device constructed as described above will be described. First, when the side cam barrel 32 shown in FIG. 3 is rotated in the clockwise direction (wide side direction) by driving the motor 112 in the normal direction, the first moving frame 24 is pulled by the tension spring 86 and is photographed together with the connecting piece 80. The second moving frame 28 moves toward the front of the optical axis 34, and moves toward the rear of the photographing optical axis 34 along the cam 118.
Thereby, the photographing magnification can be changed to the wide side. Further, in conjunction with the movement of the first moving frame 24 and the second moving frame 28, the front moving frame 210 and the rear moving frame 212 are moved back and forth on the finder optical axis 216 along the cam grooves 120 and 122 of the side cam barrel 32. The eyepiece section 2 of the viewfinder displays the subject image that has been moved and has been magnified by the zoom lens optical system and has substantially the same magnification.
52.

Next, the motor 112 is reversely driven, and the motor shown in FIG.
When the side cam barrel 32 shown in FIG. 6 is rotated counterclockwise (tele side direction), the first moving frame 24 is pushed by the connecting piece 80 and moves toward the rear of the photographing optical axis 34, and the second moving frame 28. Moves along the cam 118 toward the front of the photographing optical axis 34. Thereby, the photographing magnification can be changed to the tele side. Further, in conjunction with the movement of the first moving frame 24 and the second moving frame 28, the front moving frame 210 and the rear moving frame 212 are moved along the cams 120 and 122 by the finder optical axis 216.
The subject image is moved forward and backward, and a subject image having a magnification substantially equal to the magnification scaled by the zoom lens optical system is formed on the eyepiece 252 of the finder.

On the other hand, in the guide rods 64 to 72 of the zoom lens device described in this embodiment, first, the rear end portion is made into the case 1.
8 are press-fitted and fixed in through holes 140 to 148 formed in the rear wall portion of No. 8. As a result, the guide rods 64 to 72 are hard to fall down. Next, the through holes 130 to 1 of the fixed frame 22.
The front end portions of the guide rods 64 to 72 are guided and inserted along the tapered surface 150 at the entrance of the hole 38 to be fixed.

Therefore, in this embodiment, since it is possible to press fit the through holes 130 to 138 of the fixed frame 20 into the through holes 130 to 138 while looking at the front end portions of the guide rods 64 to 72, the guide bars 64 to 64 can be pressed. Even when the number of 72 is large, the guide rods 64 to 72 can be easily assembled to the case 18.

[0027]

As described above, according to the zoom lens device of the present invention, since the rear end portion of the guide rod is press-fitted and fixed in the through hole formed at the rear end of the case, the guide rod falls down. hard. Further, since the guide rod can be press-fitted into the through hole while looking at the front end portion of the guide rod from the through hole formed at the front end of the case, the guide rod can be easily assembled even when the number of guide rods is large.

Further, according to the present invention, since the tapered guide surface is formed at the entrance of the through hole, the end portion of the guide rod can be guided to the through hole by this guide surface. Therefore, the guide rod can be easily assembled.

[Brief description of drawings]

FIG. 1 is a perspective view of a camera-integrated VTR to which a zoom lens device according to the present invention is applied.

FIG. 2 is a perspective view of a camera unit applied to the zoom lens device according to the present invention.

FIG. 3 is a front view of the zoom lens device and the viewfinder section taken along line 3-3 in FIG.

4 is a cross-sectional view of a zoom lens device and a finder portion taken along line 4-4 in FIG.

FIG. 5 is an assembled perspective view including a first moving frame of the zoom lens device according to the present invention.

FIG. 6 is an assembled perspective view including a second moving frame of the zoom lens device according to the present invention.

FIG. 7 is a cross-sectional view showing a mounted state of a guide rod of the zoom lens device according to the present invention.

FIG. 8 is an assembly perspective view of a finder section.

[Explanation of symbols]

10 ... Camera integrated VTR 16 ... Zoom lens device 18 ... Case 24 ... First moving frame 28 ... Second moving frame 32 ... Side cam barrel 64, 66, 68, 70, 72 ... Guide rod 130, 132, 134, 136, 138 ... Through hole of fixed frame 140, 142, 144, 146, 148 ... Through hole of case 200 ... Finder section 202 ... Finder body

Claims (2)

[Claims] 1. Zooming is performed by guiding a plurality of photographic lens frames holding a photographic lens by a plurality of guide rods arranged in a case and moving the frame back and forth along the photographic optical axis in the case. In the zoom lens device, the plurality of guide bars are supported by the case by press-fitting both ends of the guide bars into through holes formed at the front end and the rear end of the case. Lens device. 2. A tapered guide surface is formed at an inlet of a through hole formed in the case so that an end portion of the guide rod is guided by the through hole. Item 2. The zoom lens device according to item 1.