JP2021004982A - Rotary filter turret - Google Patents

Abstract

To provide a rotary filter turret with which it is possible to continuously supply a power source to a filter for electronic variable dimming of light even when the turret body is moved.SOLUTION: A rotary filter turret 21 comprises: an electronic variable ND filter 17 the optical characteristic of which changes in response to a control signal; a turret body 5 that moves around a main shaft D, with the electronic variable ND filter 17 mounted therein; and a signal transmission line for transmitting the control signal outputted from a control circuit 14 which is fixed to the outside to the electronic variable ND filter 17. The signal transmission line includes: a plurality of receive-side electrodes 12, 13 which are formed in the turret body 5 and shaped to follow the movable path of the turret body 5; a plurality of control signal supply units 10, 11 for electrically connecting the control circuit 14 fixed to the outside and the receive-side electrodes 12, 13; and a plurality of control signal receive units 7, 9 for electrically connecting the receive-side electrodes 12, 13 and the electronic variable ND filter 17.SELECTED DRAWING: Figure 1

Description

The present invention relates to a rotary filter turret, and more particularly to a rotary filter turret equipped with an electronic modulatorable light filter.

Conventionally, the optical block of an imaging device such as a television camera for broadcasting has a plurality of elements such as an ND (Neutral Density) filter that attenuates the amount of light and a filter (CC filter: Color Compensating filter) that corrects color temperature characteristics. A rotary filter turret equipped with the optical filter of is used. Such an optical filter is externally or built in the image pickup apparatus, and is manually or automatically controlled to be switched to an appropriate optical filter each time and arranged on the image pickup optical path. The commonly used optical filter is a characteristic fixed type optical filter having fixed optical characteristics manufactured according to the optical characteristics (transmittance, color temperature) assumed in advance.

A conventional rotary filter turret will be described with reference to FIGS. 8 and 9. Note that FIG. 8 is a cross-sectional view corresponding to the cross section taken along line VIII-VIII when the turret body 105 is rotated 90 degrees clockwise in FIG. Further, FIG. 9 is a schematic view of each member shown in the front-rear direction in the turret portion 120 of FIG. 8 as viewed through from the rear, and illustration of screws and the like is omitted. As shown in FIG. 8, the television camera body (not shown) is provided with a turret portion 120 and an image sensor B on an optical path C of light passing from a subject A through a camera lens. The turret unit 120 includes a camera body fixing plate 102, a rotary filter turret 121, a selection switch 101 for selecting one of the filters, and the like. The camera body fixing plate 102 is a plate-shaped member for fixing the turret portion 120 to the TV camera body. The camera body fixing plate 102 is connected and fixed to the TV camera body by, for example, a screw E, and does not move.

The rotary filter turret 121 includes a turret main body 105 and a plurality of optical filters 115, 116, 117, 118 mounted on the turret main body 105. Although these optical filters have different characteristics, they are all the above-mentioned fixed-characteristic optical filters. The selection switch 101 is fixed to the main body of the television camera, and is, for example, a switch for the operator to select a filter. The selection switch 101 is provided with teeth interlocking with the intermediate gear 103. The intermediate gear 103 is pivotally supported by a main gear 104 rotatably provided in the central region of the turret body 105. Here, the internal structure serving as the main shaft of the intermediate gear 103 is connected and fixed to one area of the camera body fixing plate 102 by, for example, a screw F, and the intermediate gear 103 rotates around this internal structure. The main gear 104 is pivotally supported by an internal structure that serves as a spindle D, and rotates around the spindle D. The main shaft D of the main gear 104 is connected and fixed to another region of the camera body fixing plate 102 by, for example, a screw G. As a result, the intermediate gear 103 transmits the rotation of the selection switch 101 to the main gear 104. The main gear 104 rotates around the spindle D together with the turret main body 105 by the rotation of the intermediate gear 103. According to the above configuration, when the selection switch 101 is rotated, the intermediate gear 103 is rotated in conjunction with the rotation, and the main gear 104 is rotated to rotate the turret main body 105. This makes it possible to select a filter.

On the other hand, as a dimming element that uses a power source, an element capable of varying the reflectance is known (see Patent Document 1). The dimming element disclosed in Patent Document 1 has a structure in which an electrolytic solution is filled in a space formed by interposing a spacer between two electrode substrates. These electrode substrates are provided with a transparent electrode made of a transparent conductive film on the surface of the glass substrate. Each transparent electrode is arranged so as to face each other, and an electrolytic solution is filled between them. This electrolytic solution is a liquid in which silver (or copper) as a metal salt is dissolved in methanol. Therefore, depending on the change in the electric field applied between the two transparent electrodes, silver ions in the electrolytic solution are deposited on one (negative electrode) of the transparent electrodes to attenuate the light transmittance, or the silver adhering to the transparent electrodes is electrolyzed. It is possible to reversibly repeat the process of reducing as silver ions in the liquid and returning to the original transmittance. That is, this dimming element can change the light transmittance steplessly by applying or stopping a direct current between both transparent electrodes as a control signal.

Further, by changing the main component in the electrolytic solution between the two electrode substrates, it is possible to significantly change the spectral transmission characteristics. In that case, since the hue of the transmitted light changes, it functions as a dimming element capable of adjusting the color temperature.

Further, in addition to the dimming element disclosed in Patent Document 1, a dimming element that continuously changes the light transmittance steplessly by another operating principle is known (see Non-Patent Document 1). The dimming element disclosed in Non-Patent Document 1 has a structure in which two liquid crystal elements are sandwiched in a space formed between two linear knitting photons arranged in intersecting directions. Therefore, the shutter is fully opened when the voltage of the AC square wave is not applied, and the shutter is maintained in the closed state while the voltage is applied. Due to such an operating principle, the refraction state of the liquid crystal molecules is changed by applying a voltage to adjust the phase difference of the light, so that the light transmittance is stepless like the dimming element disclosed in Patent Document 1. Can be changed with.
In the following, various dimming elements whose optical characteristics change according to the electrical change of energization in this way will be referred to as an electronic modulatorable light filter.

Japanese Patent No. 6402113

Luminex Corporation, "LCD Shutter", [online], [Search on March 11, 2019], Internet <URL: http://www.luminex.co.jp/products/products03/products03_24.html>

When an electronic mutable light filter is mounted on a turret body equipped with multiple filters such as a TV camera for broadcasting, a control circuit that supplies a control signal and a signal that transmits the control signal to the turret section. A transmission line is required. On the other hand, in order to switch the filter, the turret body must be rotated. At this time, simply connecting the signal transmission lines may hinder the operation such as restricting the rotation, or cause the signal transmission lines to be disconnected or short-circuited.

Further, if the signal transmission line is entangled by the rotation of the turret body, the turret body may not move. Therefore, in order to prevent the signal transmission line from being disconnected or entangled, for example, the signal transmission line is temporarily disconnected only when the turret body is rotated, rotated to a desired angle, and then reconnected. It is conceivable to do. However, in that case, the power supply to the electronic modulation light filter must be stopped during the rotation operation of the turret body. As a result, it becomes impossible to stably supply power to the electronic modulatorable light filter, which deteriorates usability.

The present invention has been made in view of the above problems, and provides a rotary filter turret that can continue to stably supply power to an electronic modulation light filter even if the turret body is moved. The task is to do.

In order to solve the above problems, the rotary filter turret according to the present invention is equipped with at least one of an electronic modulatorable light filter whose optical characteristics change according to a control signal and the electronic modulatorable light filter. The signal includes a turret body that is moved around the spindle, and a signal transmission line that transmits a control signal output from a control circuit fixed to the outside of the turret body to the electronic mutable light filter. The transmission line is formed on the turret body and has a plurality of receiving side electrodes having a shape along the movable path of the turret body, and is fixed to the outside of the turret body to electrically connect the control circuit and the receiving side electrode. It has a plurality of control signal supply units that are specifically connected to each other, and a plurality of control signal power receiving units that electrically connect the receiving side electrode and the electronically modifiable light filter.

The present invention has the following excellent effects.
According to the rotary filter turret, the control signal supply unit that constitutes the signal transmission line that transmits the control signal to the electronic modulatorable light filter is fixed to the outside of the turret body, so the signal can be moved by moving the turret body. The transmission line does not get entangled. Therefore, it is not necessary to disconnect the electrical connection of the signal transmission line only when the turret body is rotated. Therefore, even if the turret body is moved, the power can be stably supplied to the electronic modulatorable light filter.

It is a schematic diagram which shows the whole turret part including the rotary filter turret which concerns on embodiment of this invention. It is a schematic view which looked at the turret part of FIG. 1 from the rear. It is a circuit diagram which shows typically the rotary filter turret which concerns on embodiment of this invention. It is a schematic diagram which shows the structural example of the control signal supply part of FIG. (A) to (d) are explanatory views which show the rotational operation of a turret body. (A) is a schematic view of the rotary filter turret according to the second embodiment, and (b) to (c) are schematic views showing the structure of a modified example of the receiving side electrode. It is a circuit diagram which shows typically the rotary filter turret of FIG. 6A. It is a schematic diagram which shows the whole turret part including the conventional rotary filter turret. It is a schematic view which looked at the turret part of FIG. 8 from the rear.

(First Embodiment)
[Construction of rotary filter turret]
First, the configuration of the rotary filter turret will be described with reference to FIGS. 1 to 3. Note that FIG. 1 is a cross-sectional view corresponding to the I-I line cross section when the turret body 5 is rotated 90 degrees clockwise in FIG. Further, FIG. 2 is a schematic view of each member shown in the front-rear direction in the turret portion 20 of FIG. 1 as seen through from the rear, and illustration of screws and the like is omitted. The size and positional relationship of the members shown in each drawing may be exaggerated to clarify the explanation. For example, the length, thickness, number, etc. of fixing members such as screws are not limited to those shown in the figure.

As shown in FIG. 1, the TV camera body (not shown) is provided with a turret portion 20 and an image sensor B on an optical path C of light passing from a subject A through a camera lens. The turret unit 20 includes a camera body fixing plate 2, a selection switch 101 for selecting one of the filters, and a rotary filter turret 21.
The camera body fixing plate 2 is a plate-shaped member for fixing the turret portion 20 to the TV camera body. The camera body fixing plate 2 is connected and fixed to the TV camera body by, for example, a screw E, and does not move.

The selection switch 1 is fixed to the main body of the television camera, and is, for example, a switch for the operator to select a filter. The selection switch 1 is provided with teeth interlocking with the intermediate gear 3. The intermediate gear 3 is pivotally supported by a main gear 4 rotatably provided in the central region of the turret body 5. The internal structure serving as the main shaft of the intermediate gear 3 is connected and fixed to one area of the camera body fixing plate 2 by, for example, a screw F, and the intermediate gear 3 rotates around this internal structure. The main gear 4 is pivotally supported by an internal structure that serves as a spindle D, and rotates around the spindle D. The main shaft D of the main gear 4 is connected and fixed to another region of the camera body fixing plate 2 by, for example, a screw G. As a result, the intermediate gear 3 transmits the rotation of the selection switch 1 to the main gear 4. The main gear 4 rotates around the spindle D together with the turret body 5 by the rotation of the intermediate gear 3.

The rotary filter turret 21 includes a plurality of optical filters, a turret body 5, and signal transmission lines 51 and 52. Here, the turret body 5 is equipped with three fixed-characteristic optical filters and one electronically modifiable optical filter whose optical characteristics change according to a control signal. As an example, the optical filters 15, 16 and 18 are optical filters having fixed characteristics.

The electronic mutable light filter will be described as an electronic variable ND filter 17 as an example. Further, the electronic variable ND filter 17 is driven by a DC control signal as an example. Specifically, the electronic variable ND filter 17 is a metal salt precipitation type electrochromic element (see Patent Document 1).

The feeding electrode (for example, the positive electrode) of the electronic variable ND filter 17 is connected to the filter feeding unit 6. The feeding electrode (for example, the negative electrode) of the electronic variable ND filter 17 is connected to the filter feeding portion 8. Here, the feeding electrode of the electronic variable ND filter 17 is a transparent electrode made of ITO formed on the surface of the glass substrate. One end of the filter feeding unit 6 is electrically connected to the transparent electrode, and the other end is connected to the control signal power receiving unit 7 via a lead wire 41. One end of the filter feeding unit 8 is electrically connected to the transparent electrode, and the other end is connected to the control signal power receiving unit 9 via a lead wire 42.

The turret body 5 is equipped with an electronically variable ND filter 17 and moves around the spindle D. The turret body 5 can rotate one or more turns in any direction. It may be configured to move at less than 360 degrees.
The signal transmission lines 51 and 52 transmit the control signal output from the control circuit 14 to the electronic variable ND filter 17.

The control circuit 14 outputs a control signal for controlling the operation of the electronic variable ND filter 17. Here, the control circuit 14 functions as a DC power supply. Depending on the type of the electronic variable ND filter 17, a control circuit that functions as an AC power source can also be used.
The control circuit 14 is fixed to the outside of the turret body 5. The control circuit 14 is not limited in the installation location in the TV camera body unless it is interlocked with the turret body 5, but it is preferably provided in the vicinity of the rotary filter turret 21.

The signal transmission line 51 includes a receiving side electrode 12, a control signal supply unit 10, and a control signal power receiving unit 7. The signal transmission line 52 includes a receiving side electrode 13, a control signal supply unit 11, and a control signal power receiving unit 9.

The receiving side electrodes 12 and 13 are formed on the turret body 5 and have a shape along the movable path of the turret body 5. The receiving side electrodes 12 and 13 are provided in a ring shape along the rotation direction of the turret body 5. The receiving side electrodes 12 and 13 are provided in a concentric shape centered on the spindle D, and the receiving side electrodes 12 are arranged on the outer peripheral side of the receiving side electrode 13. The receiving side electrodes 12 and 13 are provided at places not related to the optical path C of the incident light. When the turret body 5 rotates, the receiving side electrodes 12 and 13 rotate together with the turret body 5. As the material of the receiving side electrodes 12 and 13, for example, copper can be used. By making the receiving side electrodes 12 and 13 made of copper, long-term electrical conductivity can be ensured.

The receiving side electrodes 12 and 13 may be formed by being attached to the surface of the turret body 5.
In the illustrated example, the receiving side electrodes 12 and 13 are continuously formed from the light incident surface side to the light emitting surface side of the turret body 5. It is preferable that the receiving electrodes 12 and 13 are configured in this way because the strength is increased as compared with the case where the receiving electrodes 12 and 13 are attached to the surface.

The control signal supply unit 10 is fixed to the outside of the turret body 5 and electrically connects the control circuit 14 and the receiving electrode 12. The control signal supply unit 10 receives the control signal from the control circuit 14 and supplies it to the side electrode 12. At least a part of the control signal supply unit 10 is made of a spring material, and one end of the control signal supply unit 10 is urged in a direction of contacting the receiving electrode 12. Here, the spring material is, for example, made of copper and has excellent elastic force.

The control signal supply unit 11 is fixed to the outside of the turret body 5 and electrically connects the control circuit 14 and the receiving electrode 13. The control signal supply unit 11 receives the control signal from the control circuit 14 and supplies it to the side electrode 13. At least a part of the control signal supply unit 11 is made of a spring material, and one end of the control signal supply unit 11 is urged in a direction of contact with the receiving electrode 13.

The place where the control signal supply units 10 and 11 are fixed is not limited to the housing of the TV camera body, various boards, etc. unless it is linked to the turret body 5, but it may be provided near the turret body 5. preferable. As a result, the control signal supply units 10 and 11 remain fixed even when the turret body 5 rotates.

The control signal power receiving unit 7 electrically connects the receiving side electrode 12 and the electronically variable ND filter 17. At least a part of the control signal power receiving unit 7 is formed of a spring material, and one end portion is urged in a direction of contacting the receiving side electrode 12 by an urging force. The control signal power receiving unit 7 receives the control signal supplied to the receiving side electrode 12 by the control signal supply unit 10 on the side of the receiving side electrode 12. The control signal power receiving unit 7 is connected to the filter feeding unit 6 via a lead wire 41 on the side of the electronic variable ND filter 17. The lead wire 41 is fixed to the turret body 5.

The control signal power receiving unit 9 electrically connects the receiving side electrode 13 and the electronically variable ND filter 17. At least a part of the control signal power receiving unit 9 is made of a spring material, and one end portion is urged in a direction of contacting the receiving side electrode 13 by an urging force. The control signal power receiving unit 9 receives the control signal supplied to the receiving side electrode 13 by the control signal supply unit 11 on the side of the receiving side electrode 13. The control signal power receiving unit 9 is connected to the filter feeding unit 8 via a lead wire 42 on the side of the electronic variable ND filter 17. The lead wire 42 is fixed to the turret body 5.

With the above configuration, the electronic variable ND filter 17 can always receive the control signal from the control circuit 14.
In the circuit diagram of the rotary filter turret 21 shown in FIG. 3, the signal transmission line 51 is controlled by the lead wire 31, the control signal supply unit 10, and the receiving side electrode 12 from the positive electrode side of the control circuit 14. A signal power receiving unit 7, a lead wire 41, and a filter feeding unit 6 are provided, but the present invention is not limited thereto. For example, the control signal power receiving unit 7 made of a spring material may be directly connected to the filter feeding unit 6, or the lead wire 41 and the filter feeding unit 6 may be integrally formed.
Further, the signal transmission line 52 has a lead wire 32, a control signal supply unit 11, a receiving side electrode 13, a control signal power receiving unit 9, a lead wire 42, and a filter feeding unit 8 from the negative electrode side of the control circuit 14. And, but is not limited to this. For example, the control signal power receiving unit 9 made of a spring material may be directly connected to the filter feeding unit 8, or the lead wire 42 and the filter feeding unit 8 may be integrally formed.

Next, a configuration example of the control signal supply unit 10 will be described with reference to FIG. FIG. 4 is an enlarged view of the control signal supply units 10 and 11.
The control signal supply unit 10 has a needle-shaped member 10a at one end and an urging member 10b connected to the needle-shaped member 10a and formed of a spring material. The needle-shaped member 10a and the urging member 10b function as electrical contacts with respect to the receiving electrode 12.
The urging member 10b is provided on the lead wire 31 side in the control signal supply unit 10, and is made of a spring material using copper. Since the control signal supply unit 10 is fixed to the outside of the turret body 5, when the turret body 5 rotates, friction occurs between the needle-shaped member 10a of the control signal supply unit 10 and the surface of the receiving side electrode 12. If the urging member 10b has an elastic force that can generate an urging force that allows the needle-shaped member 10a to continue to contact even if the receiving side electrode 12 rotates, the shape, size, and spring material thereof can be changed. It can be selected as appropriate. As the type of spring as the urging member 10b, for example, a leaf spring, a disc spring, a coil spring or the like can be used.

The needle-shaped member 10a is arranged at the tip of the control signal supply unit 10 in contact with the receiving electrode 12. The shape, size, hardness, and material of the conductive material of the needle-shaped member 10a can be appropriately selected as long as the needle-shaped member 10a has a strength capable of continuing contact even when the receiving electrode 12 rotates. At the location where the control signal supply unit 10 connects to the receiving electrode 12, it is preferable that the force for suppressing and connecting the control signal supply unit 10 is sustainable for a long period of time. The tip of the urging member may be configured to come into contact with the receiving electrode 12 without providing the needle-shaped member 10a.

Further, as shown in FIG. 4, the control signal supply unit 11 has a needle-shaped member 11a at one end and an urging member 11b connected to the needle-shaped member 11a and formed of a spring material. Since the needle-shaped member 11a and the urging member 11b are the same as the needle-shaped member 10a and the urging member 10b described above except that they function as electrical contacts with respect to the receiving side electrode 13, further description will be omitted.

Further, although not shown in FIG. 4, the control signal power receiving units 7 and 9 can also use the same structure as the control signal supply units 10 and 11. That is, in this case, the control signal power receiving unit 7 has a needle-shaped member at one end on the receiving side electrode 12 side, and an urging member connected to the needle-shaped member and formed of a spring material. Similarly, the control signal power receiving unit 9 has a needle-shaped member at one end on the receiving side electrode 13 side, and an urging member connected to the needle-shaped member and formed of a spring material. In the control signal power receiving units 7 and 9, even if the turret body 5 rotates, friction between the needle-shaped members of the control signal power receiving units 7 and 9 and the surfaces of the receiving side electrodes 12 and 13 hardly occurs. Therefore, the control signal power receiving units 7 and 9 do not have to be as strong as the control signal supply units 10 and 11.

Next, the operation of the rotary filter turret 21 will be described with reference to FIG. 5 (see FIGS. 1 to 4 as appropriate). 5 (a) to 5 (d) show a part of FIG. Here, the optical filter 16 is selected when the turret body 5 is stationary at the position shown in FIG. 5A. At this time, the light from the subject A is dimmed by passing through the optical filter 16 with fixed optical characteristics deposited in advance on the optical filter 16, and is incident on the image sensor B to form an image.

Next, in the filter selection mechanism of the turret unit 20, when the selection switch 1 is rotated, the intermediate gear 3 rotates in conjunction with this, and the main gear 4 rotates, so that the turret body 5 also rotates. As a result, when the turret body 5 is rotated 90 degrees clockwise to stand still, the optical filter 15 is selected as shown in FIG. 5 (b). From this state, it may be rotated 90 degrees counterclockwise to bring about the state shown in FIG. 5 (a).

Further, when the turret body 5 is rotated 90 degrees clockwise to stand still from the state shown in FIG. 5B, the optical filter 18 is selected as shown in FIG. 5C. Further, when the turret body 5 is further rotated 90 degrees clockwise to stand still, the electronic variable ND filter 17 is selected as shown in FIG. 5 (d).

The electronic variable ND filter 17 can steplessly change the amount of light incident on the camera lens of the main body of the television camera. The operator energizes the electronic variable ND filter 17 for, for example, several seconds to several tens of seconds until the desired amount of light is reached. As a result, the light from the subject A is dimmed to the amount of light desired by the operator by passing through the electronically variable ND filter 17, and is incident on the image sensor B to form an image. In this way, it can be suitably used for broadcasting television cameras and the like, which require strict characteristics in image quality.

Further, the operator stops the energization of the electronic variable ND filter 17 for a predetermined time until the amount of light returns to the desired level, and then takes a picture. Alternatively, the operator may switch to energize a low voltage value with the opposite polarity and energize for a predetermined time before taking a picture.

In the rotary filter turret 21 according to the present embodiment, the control signal supply units 10 and 11 constituting the signal transmission lines 51 and 52 are for fixing the camera body as shown in FIGS. 5 (a) to 5 (d). It is fixed to the outside of the turret body 5 like a plate 2. Therefore, the signal transmission line that supplies power to the electronic variable ND filter 17 is less likely to be broken or entangled due to the rotation of the turret body 5. Therefore, the rotary filter turret 21 can always transmit the control signal to the electronic variable ND filter 17 regardless of the rotational state of the turret body 5.

(Second Embodiment)
Next, the rotary filter turret according to the second embodiment will be described with reference to FIGS. 6 to 7. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.
The rotary filter turret according to the second embodiment includes two electronic variable ND filters 17 and 15B as shown in the schematic views of FIGS. 6 (a) and 7 (a). The electronic variable ND filter 17 and its power supply configuration are the same as those in the first embodiment. In the second embodiment, control circuits 14 and 14B are prepared for each electronic variable ND filter, and two signal transmission lines for transmitting control signals output from each control circuit are provided. Therefore, the number of signal transmission lines is twice the number of electronic variable ND filters.

The feeding electrode (for example, the positive electrode) of the electronic variable ND filter 15B is connected to the filter feeding portion 6B. The feeding electrode (for example, the negative electrode) of the electronic variable ND filter 15B is connected to the filter feeding portion 8B.
The signal transmission lines 51B and 52B transmit the control signal output from the control circuit 14B to the electronic variable ND filter 15B.
The signal transmission line 51B includes a receiving side electrode 12B, a control signal supply unit 10B, and a control signal power receiving unit 7B. The signal transmission line 52B includes a receiving side electrode 13B, a control signal supply unit 11B, and a control signal power receiving unit 9B.
The receiving side electrode 13B is formed on the turret body 5 and is arranged on the outer peripheral side of the receiving side electrode 13. The receiving side electrode 12B is formed on the turret body 5 and is arranged on the outer peripheral side of the receiving side electrode 13B.
The control signal supply unit 10B is fixed to the outside of the turret body 5 and electrically connects the control circuit 14B and the receiving electrode 12B. The control signal supply unit 11B is fixed to the outside of the turret body 5 and electrically connects the control circuit 14B and the receiving electrode 13B.
The control signal power receiving unit 7B electrically connects the receiving side electrode 12B and the electronic variable ND filter 15B. The control signal power receiving unit 9B electrically connects the receiving side electrode 13B and the electronic variable ND filter 15B.

The rotary filter turret according to the present embodiment can always transmit control signals to the electronic variable ND filters 17 and 15B regardless of the rotational state of the turret body 5. Further, since the control circuits 14 and 14B are prepared for each electronic variable ND filter, for example, when the electronic variable ND filter 15B is used after using the electronic variable ND filter 17, the filter is actually switched. Before that, the electronic variable ND filter 15B can be pre-operated, which improves usability.

Next, a plurality of modifications of the rotary filter turret according to the embodiment will be described.
For example, in the second embodiment, two electronically variable ND filters are provided, but three or all optical filters may be electronically variable ND filters. When three or more electronic variable ND filters are provided, the turret body is provided with twice as many receiving side electrodes as the number of loaded electronic variable ND filters according to the number of loaded electronic variable ND filters. In this case as well, the number of signal transmission lines is twice the number of electronic variable ND filters.

Further, in FIG. 7, the receiving side electrodes 12, 13, 12B, and 13B are formed flush with the surface of the turret body 5, but the structure of the receiving side electrodes is, for example, FIGS. 6 (b) and 6 (FIG. 6). The configuration shown in c) may be used.

The receiving electrode shown in FIG. 6B is configured to be recessed from the surface of the turret. That is, the receiving side electrodes 12, 13, 12B, and 13B are formed to be smaller than the thickness between the light incident surface and the light emitting surface in the turret body 5B. In this case, since the material of the receiving electrode can be reduced, the rotary filter turret can be manufactured at low cost. Moreover, since the weight can be reduced, the burden on the operator when carrying the TV camera body is reduced.

The receiving electrode shown in FIG. 6C is configured to protrude from the surface of the turret. That is, the receiving side electrodes 12, 13, 12B, and 13B are formed to be larger than the thickness between the light incident surface and the light emitting surface in the turret body 5C. In this case, for example, the control signal supply unit 10 can use surfaces (upper surface, lower surface, left surface, right surface) other than the front surface of the receiving side electrode 12 as electrical contacts. Therefore, when designing the arrangement of the urging member or the like or the fixed position of the lead wire, the degree of freedom in wiring design is increased, and the design becomes easier.

In the above embodiment, the electronic neutral density filter has been described as being an electronic variable ND filter, but the present invention is not limited to this, and a filter for correcting color temperature characteristics may be used.

In the above embodiment, the electronic modulatorable light filter is a metal salt precipitation type electrochromic element driven by a DC control signal, but the present invention is not limited to this, and a liquid crystal type adjustment driven by an AC control signal is used. It may be an optical element.

Although the rotary filter turret according to the embodiment of the present invention has been described above, the gist of the present invention is not limited to these descriptions, and must be broadly interpreted based on the description of the claims. Needless to say, various changes and modifications made based on these descriptions are also included in the gist of the present invention.

1 Selection switch 2 Camera body fixing plate 3 Intermediate gear 4 Main gear 5,5B, 5C Turret body 6,8,6B, 8B Filter power supply part 7,9,7B, 9B Control signal power receiving part 10,11,10B, 11B Control signal supply unit 10a, 11a Needle-shaped member 10b, 11b Biasing member 12, 13, 12B, 13B Receiving side electrode 14, 14B Control circuit 15, 16, 18 Optical filter 17, 15B Electronic variable ND filter (electronic possible) Filter for modulated light)
20 Turret part 21 Rotary filter Turret 31, 32, 41, 42 Lead wire 51, 51B, 52, 52B Signal transmission line 101 Selection switch 102 Camera body fixing plate 103 Intermediate gear 104 Main gear 105 Turret body 115, 116, 117 , 118 Filter 120 Turret part 121 Rotating filter Turret A Subject B Image sensor C Optical path D Main axis E, F, G Screw

Claims (11)

An electronic mutable light filter whose optical characteristics change according to the control signal,
A turret body on which at least one of the electronic modulatorable light filters is mounted and movable around a spindle, and
A signal transmission line for transmitting a control signal output from a control circuit fixed to the outside of the turret body to the electronic mutable light filter is provided.
The signal transmission line is
A plurality of receiving electrode electrodes formed on the turret body and shaped along the movable path of the turret body,
A plurality of control signal supply units fixed to the outside of the turret body and electrically connecting the control circuit and the receiving electrode.
A rotary filter turret having a plurality of control signal power receiving units for electrically connecting the receiving side electrode and the electronically modulated light filter. The rotation according to claim 1, wherein at least a part of the control signal supply unit and the control signal power receiving unit is formed of a spring material, and one end thereof is urged in a direction of contacting the receiving side electrode by an urging force. Expression filter turret. The rotation according to claim 2, wherein the control signal supply unit and the control signal power receiving unit have a needle-shaped member at one end and an urging member connected to the needle-shaped member and formed of a spring material. Expression filter turret. The rotary filter turret according to any one of claims 1 to 3, wherein the receiving side electrode is continuously formed from the light incident surface side to the light emitting surface side of the turret body. The rotary filter turret according to claim 4, wherein the receiving side electrode is formed to be larger than the thickness between the light incident surface and the light emitting surface in the turret body. The rotary filter turret according to claim 4, wherein the receiving side electrode is formed to be smaller than the thickness between the light incident surface and the light emitting surface in the turret body. Equipped with a plurality of the electronic modulatorable light filters
Each of the electronic mutable light filters is provided with two signal transmission lines for transmitting control signals output from a control circuit fixed to the outside.
The rotary filter turret according to any one of claims 1 to 6, wherein the number of signal transmission lines is twice the number of electronic modulatorable optical filters. The rotary filter turret according to any one of claims 1 to 7, wherein the electronically configurable light filter is an electronically variable ND filter. The rotary filter turret according to any one of claims 1 to 7, wherein the electronic configurable light filter is a filter that corrects color temperature characteristics. The rotary filter turret according to any one of claims 1 to 9, wherein the electronic modulatorable light filter is driven by a direct current control signal. The rotary filter turret according to any one of claims 1 to 9, wherein the electronic modulatorable light filter is driven by an AC control signal.

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