JP3754733B2 - Filter disk device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a filter disk device that is used by being mounted on a photographing system, and rotates a disk to insert and remove a filter with respect to the optical axis of the photographing system to optimally set photographing conditions of the photographing system. .
[0002]
[Prior art]
Conventionally, a filter disk device is provided with a disk rotatably, and a plurality of filters for exchanging color temperature, for example, are arranged on this disk. This type of filter disk device is used by being detachably mounted on a photographing system such as a color TV camera, and after being mounted on the photographing system, the disk is rotated manually or electrically, and a filter suitable for the photographing conditions is photographed. Set to the optical axis of the system.
[0003]
In general, in a color television camera or the like that requires high image quality, two disks are provided, and these disks are often of a so-called four-position type in which four filters are arranged. However, recently, a 5-position type or a 6-position type has tended to be frequently used.
[0004]
For example, the filter disk device shown in FIG. 5 is of a five-position type, and shows a state in which the filter disk device is mounted on an imaging system (not shown) from above and below. Two discs 1 and 2 (2 are not shown) arranged in the front and back direction are provided to be rotatable around a rotation center C, and each of the discs 1 and 2 has five filters 3a to 3e. 4a to 4e (4a to 4e are not shown) are arranged. The front disk 1 is driven by a drive motor 5, and the back disk 2 is driven by a drive motor 6. The potentiometers 9 and 10 are connected to the disks 1 and 2 via the two-stage gears 7 and 8, respectively.
[0005]
Here, for example, when the filter 3c is moved on the optical axis L, the command is input to a drive circuit (not shown), and the potentiometer 9 reads the potential difference between the filter 3c and the filter 3a, and the drive motor is based on this potential difference. 5 is activated. When the disk 1 rotates, the filter 3c moves on the optical axis L. Thereafter, the operation of the drive motor 5 stops and the movement of the filter 3c stops.
[0006]
[Problems to be solved by the invention]
However, when the above-described conventional example is mounted on the photographing system from the left and right as shown in FIG. 6, the direction connecting the optical axis L of the photographing system and the rotation center C of the disk 1 is the vertical direction of the photographing system, that is, the light. The inclination is 18 degrees with respect to the direction perpendicular to the axis L. Therefore, in order to make it possible to use what is mounted from above and below from the left and right direction, the meshing of the gears 5 and 6 and the allocation of the potentiometers 9 and 10 are changed to change the optical axis. It is necessary to correct the direction connecting L and the rotation center C in the arrow direction A so as to coincide with the direction perpendicular to the optical axis L. For this reason, in order to be able to mount and use from the left and right direction, the parts such as the disk 1, the drive motors 5, 6, the two-stage gears 7, 8, the potentiometers 9, 10, etc. can be used in common. The problem arises that these parts must be reassembled from the beginning.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a filter disk device that solves the above-described problems and can be mounted on a photographing system from different directions.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a filter disk device according to the present invention is configured to rotatably hold at least one disk having a plurality of filters and rotate the disk to rotate the disk . In a filter disk device for inserting / removing an arbitrary filter to / from the optical axis of the photographing system, in a plane perpendicular to the optical axis when the disk is mounted on the photographing system from the vertical direction perpendicular to the optical axis of the photographing system a first inclined line connecting the center of rotation of the said optical axis disc in rotation of the disk and the optical axis in the plane when the disk from the left and right direction in the imaging system mounted on the imaging system the second inclined line connecting the center, and characterized in that so as to slope at the same predetermined angle to the opposite side each with respect to the vertical line of the plane passing through the optical axis That.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail based on the embodiment shown in FIGS.
FIG. 1 is a front view of the embodiment, and FIG. 2 is a right side view showing a state in which the filter disk device is mounted on a photographing system (not shown) from above and below. The two disks 11 and 12 arranged in the front and back direction are provided so as to be rotatable around a common rotation center C, and each of these disks 11 and 12 has, for example, five filters 13a to 13e and 14a to 14e. (14a to 14e are not shown) are arranged at equal intervals and fixed by adhesion or a pressing member.
[0010]
Drive motors 15 and 16 are connected to the upper peripheral edges of the disks 11 and 12 via gears 15a and 16a, respectively, and the drive motors 15 and 16 are controlled by a drive circuit (not shown). Potentiometers 17 and 18 are connected to the drive motors 15 and 16 at the upper peripheral edges of the disks 11 and 12 through two-stage gears 19 and 20, respectively. The large-diameter gear portions 19a, 20a of the two-stage gears 19, 20 are connected to the peripheral edges of the disks 11, 12, and the small-diameter gear portions 19b, 20b of the two-stage gears 19, 20 are connected to the gear portions 17a of the potentiometers 17, 18. By being connected to 18a, the rotation of the disks 11, 12 is transmitted to the potentiometers 17, 18 at a gear ratio of 1: 1, respectively.
[0011]
Here, the inclined line s connecting the optical axis L of the imaging system and the rotation center C of the disks 11 and 12 is inclined by 9 degrees counterclockwise with respect to the vertical axis v of the imaging system perpendicular to the optical axis L. Yes. For this reason, when the filter disk device shown in FIGS. 1 and 2 is rotated 90 degrees clockwise as shown in FIGS. 3 and 4 and mounted in the photographing system from the left and right directions, the filters 13a to 13e. Each of the positions 14a to 14e advances by one as compared with the case where they are mounted from above and below. Therefore, in the embodiment, a position changeover switch (not shown) for delaying the positions of the filters 13a to 13e and 14a to 14e is provided in the drive circuit or the photographing system.
[0012]
With this configuration, for example, when a command to move the filter 13c onto the optical axis L is input to the drive circuit, the potentiometer 17 causes the filter 13a between the filter 13a at the position of the optical axis L and the filter 13c at the command position. The potential difference is read, and the drive motor 15 operates based on the difference. Thereby, when the disk 11 rotates and the filter 13c moves on the optical axis L, the rotation amount of the disk 11 is transmitted to the potentiometer 17 via the two-stage gear 19, and the operation of the drive motor 15 stops.
[0013]
On the other hand, when the filter disk device of the present embodiment is mounted on the photographing system from the left and right directions, the position of the filters 13a to 13e and 14a to 14e is delayed one by one by operating the position change switch after mounting. .
[0014]
Thus, in order to be able to attach to the photographing system from the left and right directions, components such as the disks 11 and 12, the two-stage gears 15 and 16, the potentiometers 17 and 18, and the gears 19 and 20, which are conventionally the same components, are provided. What has been reassembled can be used as it is without reassembling the parts in this embodiment, and the manufacturing cost can be reduced. Further, the positions of the filters 13a to 13e and 14a to 14e can be easily aligned with the optical axis L by the position changeover switch.
[0015]
In the embodiment, the two disks 11 and 12 have been described. However, the present invention can also be applied to the case of one disk 11 or 12. Further, although the drive motors 15 and 16 are used to drive the two filter disks 11 and 12, other cylindrical ultrasonic motors, for example, can be applied. Further, the present invention can be applied to the case where the disks 11 and 12 are manually rotated. In this case, a position sensor may be used to detect the positions of the filters 13a to 13e and 14a to 14e.
[0016]
【The invention's effect】
As described above, the filter disk device according to the present invention tilts the direction connecting the optical axis of the photographic system and the rotation center of the disk by a predetermined angle with respect to the vertical axis of the photographic system. Can be installed.
[Brief description of the drawings]
FIG. 1 is a front view of an embodiment.
FIG. 2 is a right side view of FIG.
FIG. 3 is a front view of FIG. 1 rotated 90 degrees clockwise.
4 is a right side view of FIG. 3. FIG.
FIG. 5 is a front view of a conventional example.
6 is a front view of the conventional example of FIG. 5 rotated 90 degrees clockwise.
[Explanation of symbols]
11, 12 Discs 13a-13e, 14a-14e Filters 15, 16 Drive motors 17, 18 Potentiometers 19, 20 Two-stage gear

Claims (4)

A filter disk device that rotatably holds at least one disk including a plurality of filters, and rotates the disk to insert or remove an arbitrary filter of the plurality of filters with respect to the optical axis of the imaging system. In the first aspect, the optical axis and the rotation center of the disk are connected in a plane perpendicular to the optical axis when the disk is mounted on the imaging system from the vertical direction perpendicular to the optical axis of the imaging system . An inclination line and a second inclination line connecting the optical axis and the rotation center of the disk in the plane when the disk is mounted on the imaging system from the left and right directions on the imaging system are the optical axis. A filter disk device characterized by being inclined at the same predetermined angle on opposite sides with respect to a vertical line in the plane passing therethrough. The filter disk device according to claim 1, wherein the two disks are arranged such that the rotation center coincides with the optical axis direction .   The filter disk device according to claim 1, wherein the predetermined angle is 9 degrees. An imaging system equipped with the filter disk device according to any one of claims 1 to 3.

Images