JPH0434508A - Converter lens for video camera - Google Patents

Abstract

PURPOSE:To attach the converter lens in front of a photographic lens detachably by one operation by providing a converter lens guide means, a slide knob for moving the converter lens, and a click means which places the converter lens in click operation at the front position and stand-by position of the photographic lens. CONSTITUTION:The front surface of a video camera main body 10 where a zoom lens 12 is arranged aside is almost in level with the front surface of the photographic lens 12, and a lens cover 20 and an outer package cover 22 where the converter lens is housed are fitted to their front surfaces. The converter lens is movable between the front surface position of the photographic lens 12 and the stand-by position where the converter lens is moved away from the photographic lens 12 with the slide knob which is provided below the outer package cover 22 and coupled with the converter lens. Then when the converter lens is moved to the front surface position or stand-by position of the photographic lens, the converter lens is put in click operation by the click means. Consequently, the converter lens can easily be attached to the front surface of the photographic lens by one operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a converter lens for a video camera, and more particularly to a converter lens built into a camera.

[Conventional technology]

For the 1115k, converter lenses such as teleconverter lenses and wide converter lenses are available as accessories for video cameras.The teleconverter lens is attached to the front of the shooting lens when shooting telephoto shots, and the wide converter lens is attached when shooting wide-angle shots. By attaching it to the front of the photographic lens, it is possible to achieve more telephoto or wide-angle photography than with the photographic lens alone.

[Problem to be solved by the invention]

However, conventionally, this type of converter lens is attached to the mounting part of the photographic lens using a screw-in type or bayonet type, so it cannot be attached or removed with one touch to the front of the photographic lens, and if it is removed, it cannot be attached to the front of the photographic lens. However, there is a problem in that a converter lens must be carried separately, which is cumbersome to handle.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a converter lens for a video camera that can be attached to and detached from the front of a photographic lens with a single touch and is easy to handle.

[Means to solve problems]

In order to achieve the above object, the present invention provides a video camera in which a photographing lens is disposed on the side of the video camera body so as to be substantially flush with the front surface of the video camera body.
a converter lens, and a converter lens guide means disposed on the front surface of the video camera body and the photographing lens, for movably guiding the converter lens between a position in front of the photographing lens and a retracted position where it is retracted from the external photographing lens. 1. a slide knob for moving the converter lens; a click means for clicking the converter lens in a front position and a retracted position of the photographic lens; 1. It is characterized by having the following.

[Effect]

According to the present invention, a video camera is provided with a photographing lens disposed on the side of the video camera body so as to be substantially flush with the front surface of the video camera body, that is, a converter lens with a built-in camera is provided on the front surface of the camera. The converter lens is a sliding type that can be moved forward and backward in front of the shooting lens in a minimum space.

When the converter lens is moved to the front position or the retracted position of the photographing lens, the converter lens is clicked by the click means.

〔Example〕

Preferred embodiments of a converter lens for a video camera according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a camera-integrated VTR equipped with a video camera converter lens according to the present invention.

This camera-integrated VTR has a zoom lens (taking lens) 1 on the side of the video camera body lO which has a VTR section etc.
2 is placed. The front surface of the video camera body 1O and the front surface of the photographing lens 12 are almost flush with each other, and a sliding lens cover 20 and an exterior cover 22 containing a converter lens (not shown) are attached to these front surfaces. It is being

The lens cover 20 is biased by a spring in the opening direction, and is opened to a fully open state by pressing the lock release button 24 to release the lock. Further, the lens cover 20 in the open state is locked again by pulling it out to a predetermined position using the knob 20A.

On the other hand, the converter lens is a slide knob connected to the converter lens provided at the bottom of the exterior cover 22.
(not shown) allows movement between the front position of the photographic lens 12 (the position where the optical axes coincide) and the retracted position where the photographic lens 12 is retracted. In FIG. 1, 14 is an electronic viewfinder, and 16 is a microphone.

FIG. 2 shows a lens cover housed within the exterior cover;
FIG. 2 is an exploded perspective view showing the structure of a converter lens and the like.

In the figure, 20 is a lens cover, 30 is a converter lens unit including a converter lens (wide converter lens) 31, 40 and 50 are guide members, 42 is a lock lever, and 44 is a lock release lever.

In the lens cover 20, two guide pins (not shown) are formed at the lower part of the guide part 20B, and the guide part 2
A guide piece parallel to 0B is formed. The guide part 20B and the guide piece sandwich the upper part of the guide member 40,
In addition, the two guide pins are guided by the guide groove 40A on the upper part of the guide member 40, so that the lens cover 20 is attached to the guide member 40 in a cantilevered manner and is slidably guided.

The other guide member 50 is attached to the rear part of the guide member 40 with three screws.

Incidentally, a converter lens unit 30 is slidably disposed between these guide members 40, 50 as will be described later.

Further, a backing plate 52 is attached to the rear part of the guide member 50 with screws, and a lever 53, a bush 54, a torsion spring 55, and a slider 56 are arranged between the guide member 50 and the backing plate 52. ing.

That is, a pin 50A is provided on the back surface (not shown) of the guide member 50.
A lever 53 and a bush 54 are inserted into this pin 50A. A coil portion of a torsion spring 55 is attached to the tip of the lever 53, and the tip of the torsion spring 55 can be engaged with a slider 56.

The slider 56 has a guide portion 56A.
6A is slidably disposed relative to the guide member 50 by sandwiching the protrusion 50E of the guide member 50, and is biased in the direction of arrow A by the torsion spring 55.

A pin 56B is implanted on the upper surface of the slider 56, and this pin 5'6B can be engaged with the U-shaped protruding piece 20C of the lens cover 20. As a result, the lens cover 20 is constantly biased by the spring in the six directions of arrows, that is, in the opening direction.

Lock lever 42 is the lens cover 20 front A2)
- It is locked so that it cannot move against the bias of the spring 55, and is rotatably disposed on the guide member 40.

That is, a pin 40B serving as a support shaft is implanted in the guide member 40, and the support shaft portion 42A of the lock lever 42 is inserted into this pin 40B, and then the pin 41 is inserted into the guide member 40.
It is rotatably disposed on the guide member 40 by being inserted into the support shaft portion 42B of the lock lever 42 through the lower surface of the lock lever 42 .

A leaf spring 43 is disposed on the lower surface of the lock lever 42, and the tip of the leaf spring 43 can come into contact with the guide member 40. Therefore, the lock lever 42 is biased by the leaf spring 43 in a direction in which the lever tip 42C protrudes. Note that the lever tip end 42C is adapted to come into contact with the rear end 20D of the lens cover 200 when protruding.

The lock release lever 44 is rotatably disposed on the guide member 40 by a pin 45 and an E-ring 46. Moreover, between the guide member 40 and the lock release lever 44,
A coil spring 47 and a slide member 48 are provided, and the lock release lever 44 is biased in the direction of arrow B via the coil spring 47 and slide member 48.

One end 44A of the lock release lever 44 can come into contact with the rear end 42D of the lock lever 42. As a result, the other end 4 of the lock release lever 44
4B against the biasing force of the coil spring 47, the rear end of the lock lever 42! Push up B42D,
As a result, it is possible to push down the lever tip 42C and release the lock of the lens cover 20 by the lock lever 42. Note that the lock release button 24 shown in FIG. 1 can press the other end 44B of the lock release lever 44.

According to the above configuration, the lens cover 20 can be opened with one touch by pressing the lock release button 24, and the released lens cover 20 can be pulled out using the knob 20 to cover the photographing lens 12 again. I can do it. In addition, the lever tip 41 of the lock lever 42
The amount of movement when locking/unlocking the N42c is approximately the same as that of the lens cover 20, which makes it possible to realize a thinner lens.

On the other hand, the converter lens unit 30 mainly includes a wide converter lens (concave lens) 31 and a lens support frame 32.
, a lens holding plate 33, an optical axis adjustment member 34, and a slide member 35.

The wide converter lens 31 is fitted into a lens support frame 32 and fixed by a lens holding plate 33. The lens support frame 32 and the like are fixed to the optical axis adjustment member 34 by screws that are screwed into the optical axis adjustment member 34 through the long holes 33A and 32A.

Here, two elongated holes 34A are formed in the optical axis adjustment member 34, and two pins (not shown) are implanted in the surface of the lens support frame 32 facing the elongated holes 34A. Thereby, the lens support frame 32 and the like can be moved by a predetermined amount in the elongated direction (X direction) of the elongated hole 34A with respect to the optical axis adjustment member 34.

Further, the optical axis adjustment member 34 is fixed to the slide member 35 by a screw threaded into the slide member 35 through the elongated hole 34B. Here, the slide member 35 has two bottles 3.
5A is implanted, and two elongated holes (not shown) are formed in the surface of the optical axis adjustment member 34 facing the pin 35A.
It is possible to move a predetermined amount in the elongated direction (Y direction) of the elongated hole 34A.

The slide member 35 has a protrusion 35B at its lower end that is guided by the guide groove 50B of the guide member 50, and its upper and lower ends are sandwiched between the guide members 40 and 50 and are slidably guided. There is. Note that the slide knob disposed on the exterior cover 22 is connected to the protruding piece 35D of the slide member 35.
connected to.

On the other hand, the slide member 35 is formed with a hole 35C in which the ball 36 can roll, and the ball 36 is held in the holding part 35C.
A plate spring 37 is provided that presses toward the guide member 5o by the guide member 7A. Further, the guide member 50 is formed with V grooves 50C and 50D into which the balls 36 fall.

Therefore, as the slide member 35 moves, the ball 36 falls into the V-groove 50C or 50D, causing the slide member 35 to click. Furthermore, ball 3
6 falls into the V-groove 50C when the wide converter lens 31 moves to the front position of the photographic lens, and falls into the V-groove 50D when it moves to the retracted position.

Further, the leaf spring 37 is formed with a presser portion 37B that presses the optical axis adjustment member 34 toward the slide member 35 side.

That is, the optical axis adjustment of the wide converter lens 31 is performed by attaching the lens cover 20.
The wide converter lens 31 is disposed on the guide member 4.
0 and 50 are attached, the plate spring 37 is removed using a screwdriver or the like through the opening on the front surface of the lens.
The holding portion 37B prevents the optical axis adjustment member 34 from wobbling (the wide converter lens 31 swings) during adjustment in the Y direction.

In this embodiment, the camera is attached externally to the front of the video camera body and the photographic lens, but the present invention is not limited to this, and the camera may be built in the front of the video camera body in advance.

In addition, since this type of camera-integrated VTR lacks a wide angle of view, in this embodiment a macro wide wide converter lens is provided, but the invention is not limited to this, and a teleconverter lens may also be provided. You may also do so. Note that the wide converter lens can be configured with a single concave lens as shown in this embodiment, and the aperture can be made smaller than that of the teleconverter lens, so it is suitable for a built-in camera.

〔Effect of the invention〕

As explained above, according to the present invention, since the converter lens which can be freely slid is provided integrally with the video camera, the converter lens can be attached to and detached from the front of the photographing lens with one touch, and its handling becomes easy. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a camera-integrated VTR equipped with a video camera converter lens according to the present invention, and FIG. 2 is an exploded perspective view showing the detailed structure inside the exterior cover of FIG. 1. 10...Video camera body, 12...Photographing lens,
20... Lens cover 22... Exterior cover 31... Wide converter lens, 35... Slide member, 36... Ball,
37.43...Plate spring, 40.50...Guide member, 420 Tsukuru lever 44...Lock release lever 50C, 50D...Vi'! , 55...Torsion spring.

Claims (1)

[Claims] A video camera in which a photographing lens is disposed on the side of the video camera body so as to be substantially flush with the front surface of the video camera body, comprising: a converter lens; a converter lens guide means disposed on the front surface and movably guides the converter lens between a front position of the photographing lens and a retracted position where it is retracted from the outer photographing lens; and a slide knob for moving the converter lens. A converter lens for a video camera, comprising: a click means for causing the converter lens to click at a position in front of the photographing lens and at a retracted position.