JPS5830283A - Rotary filter device - Google Patents

Abstract

PURPOSE:To reduce the size and weight of a rotary filter device, by mounting plural filters freely rotatably on a disk pivoted freely rotatably. CONSTITUTION:A filter disk 10 is fitted to a frame 11 through a shaft 2 freely rotatably. A toothed wheel 10a is installed on the outer periphery of the filter disk 10 and the toothed wheel 10a is driven by a motor 16 through gears 13, 14, and 15. Another gear 20 is concentrically fitted to the filter disk 10 freely rotatably, and the gear 20 is driven by another motor 23 through gears 21 and 22. Moreover, total 6 disk filters 30a-30f are fitted to the filter disk 10 under rotation free condition and gears 31a-31f are fixed to the outer periphery of each filter 30a-30f, respectively, and they are engaged with the gear 20.

Description

[Detailed Description of the Invention] When photographing using a television camera and using an optical filter, it is possible to create a house-shaped beam of light in a video scene, to display overlapping videos, or to make such scenes center around the video. When photographing a scene with a special effect such as rotating a television camera around an axis, a rotating filter device is used that inserts a desired filter into the optical axis of a television camera and rotates the filter around the optical axis.

Conventionally, there have been many scenes where such special effects were taken, but no simple special effects device has been proposed.For example, as shown in Figure 1, a television camera lens device L and main body In reality, an extremely large special effects device 3 was inserted between the camera and the camera, and this was used for remote control photography using the operating section.

However, such conventional special effects apparatuses have various drawbacks as described below.

(1) Since the special effects device 3 is large and heavy, the center of gravity of the camera shifts, and the cam head must therefore be rebalanced.

(2) Tripod! The strength ζ must be considerably strong, and a large tripod is required.

(3) By attaching the special effects device 3, the distance between the lens device 1 and the main body 2 increases significantly, and tracking becomes impossible, so it is necessary to take measures to correct this.

(4) Depending on the function of the special effects device 3, the amount of light incident on the image pickup tube may be attenuated, and consideration must be given to correction and lighting for this purpose.

(5) Since the special effects device 3 is complicated and expensive,
It is economically difficult to attach and use it to all television cameras.

(6) The power supply section must be equipped with a separate power supply.

('7) Since television cameras are subject to restrictions due to reasons (1) to (6), photography must also be subject to restrictions.

It is an object of the present invention to solve the various drawbacks of the conventional television camera described above, to be able to be constructed so small and lightweight that it can be easily incorporated in the place where a filter device was installed in a conventional television camera, and to be inexpensive. It is an object of the present invention to provide a rotary filter device that can be manufactured in a number of ways, and that can selectively achieve various special effects through simple operations.

The rotary filter device of the present invention includes an lsl disk rotatably pivoted about an axis, an fsl rotation mechanism for rotating the first disk, and a rotatable mechanism attached to the first disk. A plurality of attached filters and a #! attached to the first disk so as to be rotatable about the axis and drivingly connected to the plurality of filters! 2 disk and rotating the filter by rotating this first disk #
! The present invention is characterized by the following rotation mechanism.

Hereinafter, the present invention will be described in detail with reference to the drawings.

#! Figures A and B are a plan view and a side view showing the configuration of an embodiment of a rotary filter device according to the present invention. A filter disk IO is rotatably attached to the frame via a shaft 12. #! - In the diagram, the frame // is indicated by a phantom line. A spur gear 10& is formed on the outer periphery of this filter disk /θ. A gear 13 of li/ that meshes with the gear of this filter disk is provided, and this #! A small-diameter second gear /11 is attached to the shaft of the l gear, a third gear /3 is provided that meshes with this second gear, and this third gear is connected to a seventh gear
Attach to the output shaft of R/B. Also, #! meshes with fsl gear /j! A q gear/7 is provided, and the q gear is fixed to the drive shaft 19 of a rotary type l tensionometer ll.

On the other hand, a j-th gear rt is rotatably mounted on the filter disk 10 concentrically with the shaft 12, and the j-th gear is connected to the #Iz gear n via the ≦th gear I. #7th gear! It is fixed to the drive shaft 21 of the motor B.

A plurality of circular filters a to 3θf, six in this example, are respectively attached to the filter disk 10 so as to be rotatable with respect to the filter disk 10. In this example, these one filters are a blind plate, transparent *glass, ND filter, mirror ash, linear focus, and cross. Each filter 3
Gears Jl&~J/ft- are fixed to the outer periphery of θa~30f, and these gears are meshed with the j-th gear Gear /3- /41-/J
-10a, it is possible to rotate the filter disk 10 and insert any one of the filters 30aN3of into the optical axis OP. Also,#! By driving the motor n of the gear ug -ff -J/a~3/f
All the filters j6a-j&f can be rotated simultaneously through the filter 30&f.
A spur gear 31& is formed at the lower end of the filter 32, and a groove 33 is formed in the upper outer wall. This groove 33
As described below, connect the filter unit to the filter disk IO
It is used to hold the camera so that it can rotate freely.

Figure D is a cross-sectional view of a filter disc 10 and a portion of the filter unit. A straight line A indicates the center line of the shaft 12, which is also the center of rotation of the filter disc.

A filter disk 10 and a third gear are rotatably mounted on this shaft 12 via a spacer 3IIN#.

To install the filter unit, the filter 32 is inserted from below into the hole drilled in the filter disc 10, and is fixed to the filter disc IO with screws p. In this way, the filter unit can be detachably attached to the filter disc 10. The filter 32 is made of brass with a surface treatment such as black matte plating to prevent diffused reflection of light, and a coating treatment based on molybdenum disulfide (MoS2) is applied to the sliding contact area with the filter disk 10. , to act as a dry lubricant. The filter disk 10 is an aluminum plate subjected to surface treatment such as black matte alumite to prevent scattering of light.

The above-described rotary filter device of the present invention is loaded in the front part of the camera head housing of a television camera, that is, between the rear part of the lens mount and the color separation prism, as shown in Figure #Ij. That is, the lens mount % attached to the main body frame aS and the glass plate 9 placed on the incident side of the color separation prism lamp.
The device can be loaded into and removed from the gap between the main body frame and the main frame along a guide rail (not shown) attached to the main body frame.

Conventionally, a filter disc equipped with an ND filter or a color temperature conversion filter has been inserted into this space, but the rotary filter device of the present invention can be inserted in place of this filter disc. Therefore, the distance between the lens system and each image pickup tube does not increase at all, and no tracking problem occurs. Also, the above void is usually 10~/j
Since the thickness is approximately s+s, the thickness of the rotary filter device of the present invention is also kept within this range. Figure 6 shows one of the drive control circuits for the above-described rotary filter device.

A local/remote switch jl is provided so that the rotation of the filter disk 10 can be operated from either the camera head side or the camera control unit side, but the figure shows the case of remote operation.

A resistor is connected between each contact of the magic rotary switch 52, and one end of this resistor is -J.
v, and * and rv are applied to the other end. The contact of the rotary switch S2 obtains a partial voltage of this voltage and leads it to the circuit 53 from the IC, where it is compared with the voltage from other input terminals, and if there is no potential difference, there is no output, so the motor circuit No voltage is applied to #I/ motor /d does not rotate.

If there is a potential difference (temporarily assumed to be a positive potential) between the other input terminal of the circuit S3 and the comparison voltage from the rotary switch S2,
Since the output has a negative potential, the transistor sa II M
However, since the base potential of transistor Sj decreases, this transistor 3j is turned off. Also, the current transistor j6 is cut off, the transistor g becomes conductive, the output circuit becomes 1/λV, and the earth → motor / ≦ → switch y4−M →
A current flows through the transistor g→-/2V, and the motor 16 rotates. If the input of the circuit S3 is a negative potential, the transistor jj r 36 becomes conductive, +/2V→transistor Sj
→ Switch a → Motor/6 → Earth and current flow to Motor 1
6 rotates in the opposite direction to the above.

The partial voltage from the potentiometer /9 directly connected to the motor lB is led to the circuit 53, and when the potential difference with the partial voltage from the rotary switch j2 disappears, the output of the circuit 53 disappears, so the emitter of the transistor jj or de Since the potential is zero, no voltage is applied to the motor 16 and it stops. Contact points M to L of the rotary switch 32 are filter discs/
This corresponds to the stop position of the filter JOeL~3σf installed at All you need to do is select the method and voltage, as well as the stopping position of the filter disc.

The motor tacho is a motor for rotating the filters 3θa to 10f, and the switch head is a selection switch for operating clockwise rotation, counterclockwise rotation, and stop, and is normally stopped, that is, connected to the earth. This switch effort is sufficient if it is a push boat switch or a switch with a home position.If you want to turn it clockwise, set it to RIGHT, and the 1/2V potential will be applied to the switch head → variable resistor J → switch 61 → relay contact C → circuit Q. Since the motor B rotates at a rotation speed proportional to the output voltage of the circuit a and in a rotation direction corresponding to the polarity thereof, the motor B rotates at a rotation speed proportional to the output voltage of the circuit a.

To stop the rotation, the switch ring can be set to the 5TOP position so that the output of the circuit 8 disappears.

The speed control switch cup changes the number of rotations of the motor N, and the resistance between the terminals thereby adjusts the number of rotations of the motor B, so the variable resistor ♂ is a resistance for fine adjustment. This rotation fine adjustment variable resistor J is necessary to match the filter rotation speed of each camera when shooting special effects using multiple cameras, or to obtain the filter rotation speed required by the video. It is a great resistance.

There is one speed control on the camera control unit side, but since it is the same circuit, its description is omitted.

Transistor cup is a transistor for local/remote switching, and Tsutomi is placed on the camera head side. When the local/remote selector switch S/ is set to local (indicating operation on the camera head side), transistor a becomes conductive and the relay is activated. The nail operates and switches the rotation of the filter disk and filtering so that it can be controlled by the circuit on the camera head side. Relay contact Q1μ, 67 is driven by this relay j.

On the other hand, indicator lamp a is turned on to indicate that it is a local operation.

As shown in FIG. 2, the mechanical system for rotating the filters JOtL to 30f is such that the driving force of a gear n connected to a shaft 24I of a motor is transmitted to a gear I, which is then transmitted to a gear I. This gear is a gear 3/&~ carved on the outer edge of a plurality of filters 33 mounted on the filter disk 10.
By rotating the filters 30a to 30f fitted in the filter, special effects can be photographed.

In addition, the switchers 69 to 71 shown in FIG. 6 are on/off switches, and the filter disk /σ and the filter 3
It is turned off when manually rotating θa to 30f. Further, the voltage divider driven by the switch 7λ is installed in the camera head section for position control, and is selected by the relay contact 67.

For its function, it is sufficient for the filter disk 10 to rotate a little over one rotation, and it is desirable to switch the filter within one second, so in this embodiment, the rotation speed of the filter disk /θ is 30 rpm.
This is the choice. However, there are countless combinations of this rotation speed if the gear ratio is appropriately selected, and the key is to select a filter switching time that satisfies the required performance while avoiding the gear ratio. Also~
The blue potentiometer can be slid from one end to the other end during a little over one rotation of the filter disc lσ, so the gear /j
, n may be adopted to meet this requirement.

Filters for various purposes such as ultraviolet sV&A, color correction, color temperature conversion, special effect practical use, and brilliance spectrum suppression are commercially available. Just select a filter and use it.

In the above-mentioned embodiment, the special effects were taken using the following special effect filters: blind plate, clear through, HD, l-chiche, linear orcus, and Kumasu Nobu. Special effect practical filters such as , color image, linear focus, soft focus, color, etc. can also be used.

All you have to do is prepare these filters in advance and select the filter configuration that suits your photographic needs.1Also, you can replace them by loosening the fixing screw screwed onto the filter disc 10.
It can be easily replaced by removing the filtering stopper V.

The rotary filter device with the desired filter attached thereto is mounted at a predetermined position within the camera head via a guide rail or the like, fixed with screws, and connected to the electrical system via a connector.

If the rotary filter device of the present invention is installed, the conventional ND
If a filter and a color temperature conversion filter are required, it may be difficult to take pictures, so as shown in Figure 7,
Two filter discs 1 each equipped with only an ND filter and a color temperature conversion filter, and omitting a filter rotation mechanism.
/, 12 are rotatably mounted on the frame 13, and a filter device in which these filter disks are rotated by a motor may be prepared separately, and consideration may be given to using it in place of the rotary filter device depending on the purpose.

Note that the present invention is not limited to the above-mentioned example, and many modifications and applications are possible. For example, in the above-mentioned embodiment, three filters were mounted on seven filter disks, and each was rotated by a single control electrical system, but the filter was
By arranging the filters back-to-back, adding an additional control electrical system, and reversing the two filters clockwise and counterclockwise, a composite special effect can be photographed. Alternatively, if two filter discs are placed back to back and one control electrical system is provided, the number of combinations of filters will further increase and new special effects can be expected. In addition, although the above embodiment was applied to a television camera, it can also be applied to an optical camera, that is, a steel camera, and it can also be applied to a filter for a theater spotlight. Furthermore, in the above-mentioned embodiments, the rotation of the filter disk and the rotation of each filter was performed using a power transmission mechanism using gears, but it is also possible to use a power transmission mechanism such as a roller, belt, or chain. You can also do it.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of a television camera incorporating a conventional special effects device; FIGS. FIG. 3 is a perspective view 1 showing the filter unit, and FIG. Figure 1 is a circuit diagram showing the configuration of an example of the drive control circuit of the rotary filter device of the present invention, and Figure #I7 is a diagram showing two filters loaded with an ND filter and a color filter. FIG. 2 is a perspective view showing a filter device combining disks. lθ...filter disk, ll...frame, /, Z
Use axis, /θa. /J + /# * /j * -2!7 r 2/
t n p 3/EL ~J/f-gear, l≦. n...Motor, 30a-30f...Filter.

Claims (1)

[Claims] L A #11 disc rotatably pivoted around the axis,
The rotation of @i which rotates this first disk, and the #
a plurality of filters rotatably attached to the respective disks of Il; a λ-th disk rotatably attached to the first disk about the axis and drivingly connected to the plurality of filters; , #14 rotation ms for rotating the filter by rotating the second disc.