JPH03230686A - Roll filter device - Google Patents

Abstract

PURPOSE:To facilitate replacement of a filter by lifting up or descending a roll filter in which various filters are connected continuously between a couple of rotary shafts depending on the rotating direction of a couple of rotary shafts. CONSTITUTION:A roll filter in which various filters 32A, 32B,... are connected continuously is wound on a couple of rotary shafts 14, 26 orthogonal to the optical axis of an image pickup lens 13 and arranged in parallel with the image pickup lens 13 inbetween and a couple of the rotary shafts 14, 26 are driven. When a couple of the rotary shafts 14, 26 are driven in one direction, the roll filter 32 is, e.g. arisen between a couple of the rotary shafts 14, 26 and when a couple of the rotary shafts 14, 26 are driven in the other direction, the roll filter 32 is descended between a couple of the rotary shafts 14, 26. Since the roll filter 32 is arisen or descended between a couple of the rotary shafts 14, 26 in the drive direction of a couple of the rotary shafts 14, 26 in this way, a desired filter is arranged on an optical axis of the image pickup lens 13. Thus, the filter is easily replaced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a roll filter device, and particularly to a roll filter device used in a video camera.

[Conventional technology]

Conventionally, filters used in video cameras include those that are screwed into the front surface of a photographic lens, and turret filters that have various filters mounted on a turret plate and are easily replaced by rotating the turret plate.

[Problem to be solved by the invention]

However, when replacing a screw-in type filter, the filter must be screwed in or removed from the screwed state to be installed or removed, which is cumbersome, and there is also the problem that fingerprints are easily left on the filter or photographic lens. .

On the other hand, there is a problem in that the use of a turret filter increases the front projected area of the camera body.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a filter that can be easily replaced without performing complicated operations or increasing the front projected area. .

[Means to solve problems]

In order to achieve the above object, the present invention has a pair of rotating shafts, each of which is orthogonal to the optical axis of a photographic lens and arranged parallel to each other with the photographic lens in between, and various filters formed in the form of a film. A roll filter that is connected and wound between the pair of rotating shafts, and a filter changing means for manually or electrically rotating the pair of rotating shafts to change the filter on the optical path of the photographing lens. It is characterized by

[Effect]

According to the present invention, a roll filter in which various filters are connected is wound around a pair of rotating shafts that are arranged orthogonal to the optical axis of the photographic lens and parallel to each other with the photographic lens in between.
A means for rotating the pair of rotating shafts was provided.

Therefore, when the pair of rotating shafts rotate in one direction, the roll filter moves up between the pair of rotating shafts, and when the pair of rotating shafts rotates in the other direction, the roll filter moves down between the pair of rotating shafts.

In this way, the roll filter moves up and down in the rotational direction of the pair of rotating shafts, for example,
A desired filter can be placed on the optical axis of the photographic lens.

〔Example〕

Preferred embodiments of the roll filter device according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an overall perspective view showing a first embodiment of a roll filter device according to the present invention. A drive shaft 14 is rotatably provided above the lens barrel 12 of the camera body 10.
2 supports a photographing lens 13. The drive shaft 14 is connected to a decelerator 18 via a belt 16, and the decelerator 18
is connected to the motor 20. The decelerator 18 and the motor 20 are attached to the camera body 10 or the lens barrel 12.

In front of this drive shaft 14, a roller 22 is attached to the camera body 10.
Alternatively, it is rotatably supported by the lens barrel 12.

A position sensor 24, which will be described later, is provided between the roller 22 and the drive shaft 14.

Below the lens barrel 12, a driven shaft 26 is rotatably supported by the camera body 10 or the lens barrel 12. One end of a wire 28 is attached to the driven shaft 26, and one end of the wire 28 is wound around the driven shaft 26 in a clockwise direction. Further, the other end of the wire 28 is attached to a spring 30, and the spring 30 is locked to the camera body 10 or the lens barrel. Therefore, a rotational force in the clockwise direction is applied to the driven shaft 26, and an urging force in the six directions of the arrows is applied. In addition, the driven shaft 26
A roller 22 is rotatably supported in front of the camera body 10 or lens barrel 12.

One end of the roll filter 32 is attached to the drive shaft 14, and the other end is attached to the driven shaft 26. This roll filter 32 is moved in front of the photographic lens 13 (drive shaft 14, driven shaft 26
(between). roll filter 3
2 are various filters 32A, 32B, as shown in FIG.
32C.

32D, 32E... are successively connected, and position setters 34A, 34B, 34C, 3 are provided between each filter.
4D... is provided. This position setter 3
4A, 34B, 34C134D-... are detected by the position sensor 24 shown in FIG.

In FIG. 1, numeral 36 is a liquid crystal display section (described later), 38 is a finder, 40 is a record button, and 42 is a cassette section. I will explain based on this.

First, switch 48A provided on camera body 10
When the switch 48B is pressed, a forward rotation command is transmitted to the motor 20 via the system control unit 50 and the motor driver 52, and when the switch 48B is pressed, a reverse rotation command is transmitted to the motor 20.

When the motor 20 is driven in this manner, its rotational force is transmitted to the drive shaft 14 via the reducer 18 and the belt 16. In this case, when the motor 20 rotates in the normal direction, the drive shaft 14 rotates clockwise in FIG. Rotates in the opposite direction against rotational force. Further, when the motor 20 reverses, the drive shaft 14 rotates in the half-clockwise direction, and the driven shaft 26 rotates in the rotational direction biased by the biasing force of the spring 30 (i.e., clockwise), so that the filter 32 Wind up. Therefore, the roll filter 32 moves vertically in FIG.

At this time, the position sensor 24 is activated by the position setter 34A.
, 34B, 34C, etc. are detected, a detection signal is inputted to the /stem control section 50, the drive command to the motor 20 is stopped, and the filter number detected by the position sensor 24 is displayed on the liquid crystal display section 36. . Therefore, press the switch 48A or 48B to advance the roll filter one filter at a time, and the desired filter number, for example, ND filter 1101 (here, the ND filter is a light amount cut filter) is displayed on the liquid crystal display section 36.
The filter setting is complete when the screen is displayed.

In the embodiment described above, the roll filter 32 is placed in front of the front lens of the photographic lens 13, but the invention is not limited thereto, and the roll filter may be placed near the diaphragm as shown in FIG. Since the light beam near the diaphragm is narrower than when it is installed in front of the front lens, it is possible to downsize the roll filter device.

In addition, in FIG. 4, 12A is a zoom lens barrel, 12B is a focus lens barrel, and 12C is a diaphragm section, and the roll filter device shown in FIG. 4 has approximately the same structure as the roll filter device in FIG. 1. Therefore, the same reference numerals are given and the explanation is omitted.

In the first embodiment, the drive shaft 14 is rotated by the motor 20, but the invention is not limited to this, and the drive shaft may be rotated manually as shown in FIGS. 5 and 6.

That is, the rotary knob 60 is fixed to the drive shaft.
0 protrudes from the camera body 10, and the drive shaft can be rotated by operating a knob on the protruding part.

In this case, the filter display plate 62A of the roll filter 62
, 62B, 62C, 62D, and 62E, the name of each filter is written in advance, and the name is displayed from the opening 64 of the camera body 10. For example, in FIGS. 5 and 6, the filter Nα32A (light amount cut filter 1, hereinafter referred to as ND1) is arranged in front of the photographic lens 13, and the opening 64
The MDI of the filter display board 62A is displayed from .

Incidentally, in FIGS. 5, 6, and 7, the same or similar members as in FIGS. 1 and 2 are designated by the same reference numerals, and explanations thereof will be omitted.

〔Effect of the invention〕

As described above, according to the roll filter device according to the present invention, the roll filter in which various filters are continuously connected can move in the rotational direction of the pair of rotating shafts; Since the filter is lowered, a desired filter can be placed on the optical axis of the photographic lens. Therefore, the filter can be easily replaced, and the front projected area does not increase unlike a turret filter.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view showing a first embodiment of a roll filter device according to the present invention, FIG. 2 is a plan view showing a roll filter used in the roll filter device according to the present invention, and FIG.
The figure is a block diagram showing the structure of the roll filter device according to the present invention, FIG. 4 is a schematic overall diagram showing a second embodiment of the roll filter device according to the present invention, and FIG. 5 is a block diagram showing the structure of the roll filter device according to the present invention. An overall view showing the third embodiment attached to the camera body, FIG. 6 is an enlarged view of the main parts of the third embodiment according to the present invention, and FIG. 7 is a roll filter device of the third embodiment according to the present invention. It is a top view showing a roll filter used for. 10... Camera body, 12... Lens barrel, 13...
・Photographing lens, 14... Drive shaft, 20... Motor, 26... Driven shaft, 28... Wire, 3
2... Roll filter, 32A, 32B, 32C, 3
2D, 32E...filter.

Claims (1)

[Scope of Claims] A pair of rotating shafts, each of which is perpendicular to the optical axis of the photographic lens and arranged parallel to each other with the photographic lens in between, are connected to various filters formed in the form of a film. A roll comprising: a roll filter wound between rotating shafts; and filter changing means for manually or electrically rotating the pair of rotating shafts to change the filter on the optical path of the photographing lens. filter device.