JP3627832B2 - TV lens - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a television lens, and more particularly to a studio or field television lens provided with means for reducing the emission and mixing of unwanted radiation noise.
[0002]
[Prior art]
In general, a television lens called an EFP lens is widely used in television shooting in a studio or outdoor sports broadcasting. This type of television lens includes a focus lens group and a zoom lens housed in a metal lens barrel, and includes driving means for electrically driving the lens group and the like around the lens barrel and various other detection systems. A control circuit board is attached to form a lens body. In general, the lens body is surrounded by a metal cover.
[0003]
In addition, a cable receiver for detachably connecting a cable for transmitting an external signal is generally provided on the bottom or side surface of the TV lens, and a cable for transmitting a control signal from a focus demand or a control box to the connector receiver. This connector can be used to control various operations such as focus, zoom, iris, and extender of the TV lens.
[0004]
[Problems to be solved by the invention]
However, since the conventional television lens does not necessarily have sufficient countermeasures against unnecessary radiation noise around the cable to which a cable for transmitting an external signal is connected, the high frequency noise superimposed on the cable enters the television lens, and lens driving means or the like There is a problem in that noise may be mixed in various control signals and cause malfunction. In particular, in a television lens that requires high lens position accuracy, there is a problem that a focus lens that has been subjected to focus adjustment is out of focus when malfunctioned by several μm.
[0005]
In recent years, it has been desired that EMC (generic name for electromagnetic interference (EMI) and electromagnetic interference (EMS)) measures be taken for general electrical equipment. In addition, countermeasures against electromagnetic interference have become necessary for television lenses.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a television lens that can reduce the mixing of unnecessary radiation noise and has excellent noise resistance.
[0008]
[Means for Solving the Problems]
BookIn order to achieve the above object, the present invention is connected to a TV lens via a multi-core first cable, and includes a focus lens group, a zoom lens group, an iris, and an extender of the TV lens.ChinoA first control device that outputs a first signal that controls at least one; a focus lens group of the television lens connected to the first control device via a second cable; a zoom lens group; an iris; And a second control device that outputs a second signal for controlling the other one of the extenders, and the second control signal output from the second control device is the first control device. In the television lens configured to relay to the television lens from the first control device via the first cable together with the first signal, in the casing of the first control device, An annular unnecessary radiation noise removing member through which the first cable and the second cable are inserted is provided, and high frequency noise superimposed on the first cable and the second cable is reduced. It is characterized.
[0009]
According to the present invention, a first signal for controlling one of the focus lens group, the zoom lens group, the iris, and the extender of the television lens is transmitted from the first control device to the television lens via the first cable. The second control device outputs a second signal for controlling the other one different from the first control device to the first control device via the second cable. The second signal is relayed by the first control device, and is guided from the first control device to the television lens through the first cable together with the first signal. In the casing of the first control device, the first and second cables are both passed through an annular unnecessary radiation noise removing member. As a result, unnecessary radiation noise superimposed on the first and second cables is not guided into the television lens, and it is possible to prevent a malfunction that causes malfunction due to noise mixed in various control signals of the television lens.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a television lens according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view showing a configuration of a lens body of an EFP lens to which a television lens according to the present invention is applied, and FIG. 2 is a perspective view of a cover covering the lens body. As shown in FIG. 1, the lens body 10 mainly includes a lens barrel 14 in which a lens 12 is accommodated, a body bottom plate 16 and a mount frame 18. The body bottom plate 16 is assembled to the lower surface of the lens barrel 14. A mount frame 18 is assembled to the rear end of the lens barrel 14.
[0011]
The lens barrel 14 is made of a metal material (for example, magnesium), and a focus lens group and a zoom lens (not shown) are accommodated in the lens barrel 14 so as to be movable along the optical axis.
The focus lens group and the zoom lens are each electrically driven by a servo module (not shown) assembled to the lower part of the lens barrel 14. Further, an iris (not shown) is disposed in the lens barrel 14, and the iris is also electrically driven by a motor 20 attached to the outer peripheral surface of the lens barrel 14 so that the aperture value can be changed. Yes.
[0012]
Further, an extender lens (not shown) is rotatably mounted on the lens barrel 14. The extender is rotationally driven by a motor 22 attached to the outer peripheral surface of the lens barrel, and enters or retracts from the optical axis. The drive mechanism of the extender is linked to an extender switching knob 26 provided on the mount frame 18, and the extension / retraction of the extender lens can be switched manually by turning the extender switching knob 26.
[0013]
On the side surface of the lens barrel 14, an electronic circuit board 28 including a control circuit for controlling various drives such as the focus lens, the iris, and the extender is attached. The circuit board 28 includes a circuit for converting various operation signals input from the outside into a lens control signal, and other control circuits for transmitting power and signals from the camera to the lens side. Although not provided, various signals are applied through appropriate wiring, and electrical signals for controlling the driving of the motors 20, 22 and the like are output from the circuit board 28.
[0014]
A tally lamp bulb 30 is fixed to the left corner of the circuit board 28. Usually, a pair of tally lamps are provided on the left and right sides of the television lens. Although not shown in the drawing, a tally lamp bulb is similarly provided on the opposite side surface of the lens barrel 14. The tally lamp bulb 30 is not limited to being fixed on the circuit board 28, but may be fixed by arranging an appropriate attachment member.
[0015]
The front side of the lens barrel 14 is formed in a cylindrical shape, and a step 32 is provided along the outer peripheral surface of the end edge of the cylindrical portion 14A. The edge of the cover, which will be described later, comes into contact with the peripheral surface step 32 (see FIG. 2). A mesh conductive elastic member 34 is adhered to the peripheral surface step 32, that is, a portion in contact with the edge of the cover, and is electromagnetically shielded when the cover is mounted. In the case where the cylindrical portion 14A including the step 32 is to be coated, in consideration of the fact that conduction is blocked by the paint, a copper anchor tape is attached to the conductive elastic member 34, and the copper anchor tape is Conduction is achieved by screwing and fixing to a female screw portion (tap) formed in the stepped portion. Alternatively, the adhesion region of the conductive elastic member 34 may be masked so that the paint does not adhere thereto, or may be conductive by applying conductive coating.
[0016]
Below the lens barrel 14, a body bottom plate mounting plate 36 and an angle member 38 orthogonal thereto are provided. The plate 36 and the angle member 38 are made of a metal material, and a tube-shaped conductive rubber 40 is fixed to the front surface of the angle member 38. When the angle member 38 is coated, the adhesive region of the conductive rubber 40 is masked to prevent the paint from adhering thereto, or is conductive by applying a conductive coating. The body bottom plate 16 is screwed to the angle member 38 and the plate 36.
[0017]
The body bottom plate 16 shown in the lower part of FIG. 1 has left and right side surfaces 42 and 43 bent downward, and a tubular conductive rubber is formed outside the side surfaces 42 and 43 in the same manner as the angle member 38. 46 and 46 are fixed. Further, three through capacitors 48, 49, 50 are attached to the upper surface 47 of the body bottom plate 16, and a battery cable connector receiver (not shown) is provided on the back surface of the through capacitors 48, 49, 50. ing. A battery cable connector is detachably connected to the connector receptacle so that a DC12V power source is led from the battery. The role of the feedthrough capacitor will be described later.
[0018]
The body bottom plate 16 has stepped flat portions 52 and 52 formed behind the three feedthrough capacitors, and a multi-pin connector receiver (not shown) is provided on the back surface of the flat portions 52 and 52. A connector of a cable that transmits an external signal is detachably connected to the connector receiver (see FIGS. 11 and 12).
[0019]
Various signal lines 54 are connected to the pins of the connector receiver, and these signal lines are bundled as shown in the figure and passed through detachable ferrite cores 56. The ferrite cores 56 and 56 are formed in a substantially hollow cylindrical shape, and are divided into two along the axis. Each of the two divided pieces is housed in a plastic case and connected by a hinge. The ferrite cores 56 and 56 are fixed to the signal line bundles 57 and 58 by opening the ferrite cores 56 and 56 and sandwiching the bundled signal lines (signal line bundles) 57 and 58. Such a two-divided ferrite core 56 not only can be easily fixed to a wired cable or a cable connected to a connector, but also in a case where a large DC current flows in the same line. There is an advantage that the magnetic saturation of the core is less likely to occur compared to the undivided one.
[0020]
Each signal line passed through the ferrite cores 56 is led to a circuit board 28 or the like assembled to the lens barrel 14. For example, the left signal line bundle 57 includes zoom and focus control signal lines, and the right signal line bundle 58 includes iris and extender control signal lines. In this way, the signal lines are bundled near the entrance of the connector input from the outside and passed through the ferrite cores 56 and 56, thereby preventing the occurrence and mixing of unnecessary radiation noise.
[0021]
In this case, the means for reducing unwanted radiation noise is not limited to the ferrite core 56, and a noise prevention means (EMI removing means) having the same function may be used.
By the way, in order to assemble the body bottom plate 16 to the lens barrel 14, the upper surface 47 of the body bottom plate 16 is brought into contact with the plate 36 fixed to the lower portion of the lens barrel 14, and the front end surface of the body bottom plate 16 is set to the lens barrel lower portion. The screw is fixed to the angle member 38 fixed to the screw and assembled. Thus, a recess surrounded by the angle member 38 and the body bottom plate 16 is formed in the lower portion of the lens barrel 14. Conductive rubber 40, 46, 46 is provided on the three side surfaces (38, 42, 43) that define the recess. A rectangular servo module (not shown) is incorporated in the recess.
[0022]
Two sets of servo modules, one for focus drive and one for zoom lens drive, are assembled, and each servo module is electrically connected to the lens body 10 via a connector and transmits a driving force. Are mechanically coupled to the lens body 10 via a coupling.
Next, the mount frame 18 will be described.
[0023]
The mount frame 18 is a block that is assembled to the rear end of the lens barrel 14. The rear wall of the mount frame 18 is formed with an opening 18A through which photographing light that has passed through the lens barrel 14 is guided. A camera (not shown) is attached to the rear wall of the mount frame 18.
On the side of the mount frame 18, an indicator 60, an extender switching knob 26, and a tracking adjustment knob 62 are provided from above. The indicator 60 displays the state of the TV lens such as zoom and iris by LED lighting, and the LED used for this display is connected to a circuit board 28 attached to the lens barrel 14 via an electric cable 64. A specific LED is turned on according to the state of the lens. The indicator display unit will be described later.
[0024]
The extender switching knob 26 is assembled to a front wall of a recess formed on the side surface of the mount frame, and the rotational force of the extender switching knob 26 is the drive mechanism of the extender described above via a power transmission mechanism such as a gear (not shown). It is transmitted to (motor 22).
The tracking adjustment knob 62 is provided so that the imaging position of the lens can be adjusted, and is connected to a master lens driving mechanism (not shown). The rotational force of the tracking adjustment knob 62 is transmitted to a master lens driving mechanism in the lens barrel via a power transmission mechanism such as a gear (not shown) so that the lens imaging position can be finely adjusted by manual operation. . The configuration of the extender switching knob 26 and the tracking adjustment knob 62 will be described later.
[0025]
A U-shaped notch 65 is formed at the lower part of the mount frame 18, and a rectangular tube-like convex part 66 formed at the rear of the body bottom plate 16 is assembled to the notch 65 in surface contact.
Further, a step 68 is formed along the outer periphery of the top surface of the mount frame 18 and on the left and right side tips, and the conductive rubber 69 is embedded in the step 68 without interruption. An end surface of a lens cover 70 to be described later comes into contact with the conductive rubber 69 at the step portion, and is electromagnetically shielded when the cover is mounted.
[0026]
FIG. 2 is a perspective view of a lens cover 70 surrounding the lens body 10 shown in FIG. The lens cover 70 shown in the figure is a part where the front cover 72 covering the cylindrical portion 14A of the lens barrel 14 and the cylindrical portion 14A of the lens body, that is, the circuit board 28 and the motor 20 are assembled. It consists of two pieces of body cover 74 that surrounds. The front cover 72 is formed in a substantially rectangular tube shape, and a circular opening 76A through which the cylindrical portion 14A of the lens barrel is inserted is formed in the rear wall surface 76 of the front cover 72.
[0027]
The main body cover 74 is also formed in a substantially square cylindrical shape, and a circular opening 78A through which the cylindrical portion 14A of the lens barrel is inserted is formed in the front wall surface 78 of the main body cover 74. The front wall 78 of the main body cover and the rear wall 76 of the front cover can be integrated by connecting them with four screws 79 with their openings matched.
A tally lamp window 80 and a concave portion 81 to be a carrying handle are formed in order from the front on the left and right sides of the main body cover 74, and a fixing screw 82 for connecting the cover and the main body is provided at the rear of the handle. ing. The tally lamp window 80 is a portion that allows the light of the tally lamp bulb 30 fixed to the lens barrel 14 to be seen from the outside, and an opening is formed in a corresponding portion of the main body cover 74, and the opening has a mesh shape. After attaching a woven metal net (not shown), the opening is sealed from above with a red transparent resin member. By providing the metal net in this way, the light from the lamp can be passed, and at the same time, unnecessary radiation noise can be prevented from entering. Moreover, the approach of unnecessary radiation noise can also be prevented by conducting a conductive treatment on the back surface of the resin member instead of attaching a metal net. The conductive treatment is not limited to the back surface of the resin member, but may be the front surface or the entire front and back surfaces.
[0028]
The lower surface of the main body cover 74 is cut out in the shape of an open letter U so that the recess for incorporating the servo module formed in the lower part of the lens barrel 14 is not closed when the cover is attached. Yes.
The lens main body 10 shown in FIG. 1 is inserted from the rear of the lens cover 70 formed by connecting the front cover 72 and the main body cover 74 shown in FIG. 2, and the lens main body 10 is attached to the lens cover. Surrounded by 70. That is, on the front side of the lens body 10, the step 32 of the cylindrical portion 14 </ b> A comes into contact with the circumferential edge on the back side of the front wall surface 78 of the body cover, and the lower side of the lens body 10 defines three recesses that incorporate the servo module. The side wall, that is, the angle member 38 and the left and right side surfaces 42 and 43 of the body bottom plate come into contact with the three sides of the U-shaped notch 74A formed on the lower surface of the main body cover 74, respectively. Further, the rear end surface of the main body cover 74 is brought into contact with a step 68 formed on the mount frame 18 of the lens main body 10, and the lens cover 70 and the lens main body 10 are connected by fixing screws 82 and 82 in this state.
[0029]
At this time, the contact portion between the lens body 10 and the lens cover 70 is provided with the conductive elastic member 34 and the conductive rubbers 40, 46 and 69 as shown in FIG. The conductive elastic member 34 and the conductive rubbers 40, 46, and 69 are deformed so that they are in close contact. The lens cover 70 can also be electrically connected to each contact portion with the lens body 10 by masking the contact area so that the paint does not adhere to the contact area, or by applying a conductive coating to the contact area. The electromagnetic shield is strengthened by the close contact between the lens body 10 and the lens cover 70.
[0030]
As described above, the conductive elastic member 34 and the conductive rubbers 40, 46, and 69 are provided in the contact portion between the lens cover 70 and the lens body 10, and the lens cover 70 side is subjected to a treatment capable of conducting the contact portion. As a result, the shielding performance of the lens body, particularly the portion including the electric system, can be improved, and the mixing of unnecessary radiation noise can be reduced.
Next, the role of the feedthrough capacitor will be described.
[0031]
A feedthrough capacitor is a capacitor configuration in which a dielectric is filled between a rod-shaped center electrode and a cylindrical external electrode. Generally, a high-frequency short-circuit is caused at a portion where the wiring penetrates the casing or shield wall of the device. It is inserted where it should be done. FIG. 3 shows an enlarged view of the vicinity of the feedthrough capacitor shown in FIG. The feedthrough capacitors 48, 49, 50 shown in the figure are formed with screw threads around the cylindrical outer electrodes 48A, 49A, 50A, and are directly screwed into and fixed to the taps formed on the body bottom plate 16. Has been.
[0032]
FIG. 4 is a block diagram showing a portion to which a feedthrough capacitor is applied. When the TV lens 100 and the camera 102 are assembled, they are electrically connected via an interface (not shown), and the camera-side power supply 103 (DC12V) is supplied to the lens side. On the other hand, a separate battery 104 can be detachably connected to the lens side via a connector, and the TV lens 100 can also receive power supply from the battery 104. The feedthrough capacitors 48, 49, 50 are provided immediately after receiving the connector of the power supply line from the battery 104.
[0033]
FIG. 5 is an enlarged view showing the structure of the battery connector and the connector receiver. FIG. 5 shows a state where the battery connector 110 is not connected to the connector receiver. The battery connector 110 has a hollow cylindrical shape at the tip, the central portion corresponds to a negative pole, and the outer peripheral surface of the cylinder is a positive pole. The space between the negative electrode and the positive electrode is filled with an insulating material. On the other hand, the connector receiving side has three terminals in order from the left in the figure: a negative power supply terminal 121, a terminal 122 connected to a positive power supply (+ VA) from the camera side, and a positive power supply terminal 123 supplied to the lens side. The feedthrough capacitors 48, 49 and 50 shown in FIG. 3 are connected to each terminal.
[0034]
The tip of the negative power supply terminal 121 is formed in a pin shape that can be fitted into the negative pole of the battery connector 110. The negative power supply terminal 121 is short-circuited to the negative electrode of the camera-side power supply via the feedthrough capacitor 48 and is also short-circuited to the negative electrode on the lens side. Thus, the negative pole is shared by the camera side power source and the battery power source.
[0035]
A contact member 122A is connected to the terminal 122 shown in the center of the figure, and the terminal 122 is connected to (+ VA) of the camera side power supply via a feedthrough capacitor 49.
A contact piece 123A is elastically supported by the terminal 123 shown at the right end in the drawing, and the contact piece 123A contacts the contact member 122A when the battery connector 110 is not connected (normal state). doing. When the battery connector 110 is connected to the connector receptacle, the contact is separated. Further, the terminal 123 is connected to a positive power source on the lens side through the feedthrough capacitor 50. Accordingly, when the battery connector 110 is not connected, the positive power source + VA and the negative power source (−) on the camera side are connected to the power input on the lens side, and power is supplied from the power source on the camera side to the lens side. It has become.
[0036]
FIG. 6 shows a state where the battery connector is connected. When the battery connector 110 is connected to the connector receptacle, the pin 121 of the connector receptacle is fitted into the negative pole of the battery connector 110, and the outer peripheral portion (plus pole) of the connector 110 spreads the contact piece 123A, and the contact member 122A The contact of As a result, the power (+ VB) from the battery 104 is supplied to the lens side.
[0037]
As described above, since the feedthrough capacitor is provided immediately after the connector receiving of the power supply line to be input to the lens side, unnecessary radiation noise is prevented from being mixed.
Next, the indicator display unit will be described.
FIG. 7 is an enlarged view showing the configuration of the indicator display section provided on the side surface of the mount frame 18. As shown in FIG. 7, a rectangular opening 130 is formed on the side surface of the mount frame 18, and a plurality of LEDs (not shown) are arranged inside the opening 130. And this opening part 130 is piled up and closed in order of the metal net 132 knitted in mesh shape, the metal plate 134, and the plastic indicator board 136. The metal plate 134 is punched with holes 134A for transmitting LED light.
[0038]
FIG. 8 is a diagram illustrating an example of the indicator plate 136. On the surface of the indicator plate 136 are formed numbers and characters indicating zoom (focal length), iris (IRIS) aperture value, extender magnification, etc., and corresponding LED light emission windows 136A, etc. The LED to turn on lights up to display the state of the TV lens.
[0039]
As described above, by improving the shielding performance of the opening 130 shown in FIG. 7, it is possible to prevent unwanted radiation noise from entering from the opening 130. Further, even if at least one of the mesh-shaped metal net 132 or the metal plate 134 is used, a corresponding effect can be recognized. In addition, intrusion of unnecessary radiation noise can be prevented by applying a conductive process (for example, a conductive thin film deposition process) to the back surface of the plastic indicator plate 136. The conductive treatment is not limited to the back surface of the indicator plate 136, but may be the front surface or the entire front and back surfaces.
[0040]
The reason why the metal plate itself 134 is not used as a substitute for the plastic indicator plate 136 is that it is necessary to make the LED display visible. This is because there is a problem that dust or the like may be mixed inside.
Next, the configuration of the tracking adjustment knob and the extender switching knob provided on the side portion of the mount frame will be described.
[0041]
FIG. 9 is an exploded perspective view of the extender switching knob 26 shown in FIG. As shown in the figure, the extender switching knob 26 has a central shaft 140 made of a plastic material (for example, polyacetal resin such as Delrin), and a gear 142 fixed to the tip of the central shaft 140, and the rear end of the shaft. The knurled ring 146 is fixed to the ring 144 via the ring 144. Conventionally, since the central axis of this type of knob is made of a metal material, the metal axis serves as an antenna for receiving unnecessary electromagnetic waves, and unnecessary radiation noise is mixed into the lens body through the metal axis. was there.
[0042]
Therefore, as shown in FIG. 9, the central shaft 140 of the extender switching knob 26 is formed of a non-conductive material, thereby preventing unwanted radiation noise from entering.
FIG. 10 is an exploded perspective view of the tracking adjustment knob 62 provided on the side of the mount frame. The tracking adjustment knob 62 shown in the figure also has a central shaft 148 made of a plastic material, like the extender switching knob 26 described above. The central shaft 148 is inserted into the cylindrical member 150, and a male screw member 151 having a screw formed on the outer periphery is fixed to the tip of the cylindrical member 150. A screw portion 150A is formed at the rear end portion of the cylindrical member 150, and a knurled ring 152 is screwed into the screw portion 150A and assembled to the rear end of the central shaft 148. In this way, by forming the central axis 148 of the tracking adjustment knob 62 with a non-conductive material, the central axis 148 does not act as an antenna that receives unnecessary electromagnetic waves, and can prevent the introduction of unnecessary radiation noise. it can.
[0043]
FIG. 11 is a block diagram showing a state in which an extender switching controller (ERS) 160 and an iris controller (EIC) 162 are connected in series to the television lens 100.
That is, the extender switching controller 160 is connected to the television lens 100 via a multicore cable 164 (first cable), and the iris controller 162 is connected to the extender switching controller 160 via a cable 166 (second cable). It is connected. Note that connectors 164A, 164B, 166A, and 166B are used at the connection portions of the multicore cable 164 and the cable 166, respectively, in consideration of the ease of attachment and detachment.
[0044]
The extender switching controller 160 is provided with a switch (not shown) for switching the shooting magnification to 1 × (1 ×) or 2 × (2 ×). The extender switching controller 160 responds to the operation of the switch. A voltage signal (extender switching signal) is output. On the other hand, the iris controller 162 is provided with a volume knob (not shown) that can continuously change the iris diaphragm value of the TV lens 100, and the iris controller 162 has a voltage corresponding to the operation of the volume knob. A signal (iris control signal) is output.
[0045]
The iris control signal output from the iris controller 162 is once guided to the extender switching controller 160, and is output from the extender switching controller 160 together with the extender switching signal via the board 160A of the extender switching controller 160. Led to 100. Note that the iris control signal is output as it is without being subjected to special deformation when relayed by the board 160A.
[0046]
The present embodiment is characterized in that the iris control signal output from the iris controller 162 is guided to the extender switching controller 160, the signal line 166 (iris control signal line), and output from the extender switching controller 160 and input to the television lens 100. The signal line cable (multi-core cable) 164 through which the extender switching signal and the iris control signal are led together is put together in the casing of the extender switching controller 160 and passed through one ferrite core 168. The signal line cable 164 is configured by bundling together two signal lines for guiding the extender switching signal and signal lines for guiding the iris control signal.
[0047]
The method of inserting a ferrite core as shown in the figure is called a common mode choke, and the magnetic field generated by the signal current cancels each other on the way and back, and no insertion loss is given to the signal. On the other hand, the noise current generates a magnetic field in one direction and causes an insertion loss. That is, a loss is given only to noise.
In this way, the iris controller 162 and the extender switching controller 160 are connected in series to the television lens 100, and both the iris control signal line cable 166 and the multi-core cable 164 output from the extender switching controller 160 are connected together. Since the two ferrite cores 168 are combined, noise superimposed on the signal lines can be effectively removed, and space saving and cost reduction can be achieved as compared with the case where the ferrite cores are individually fixed to the respective cables. be able to.
[0048]
In this case, the means for reducing the noise superimposed on the signal line is not limited to the ferrite core 168, and a noise prevention means (EMI removing means) having the same function may be used.
In FIG. 11, the combination of the two controllers, the extender switching controller and the iris controller, has been described. However, the present invention is not limited to this combination. It can also be applied to combinations.
[0049]
FIG. 12 is a perspective view showing a connection relationship between the television lens 100, the focus demand 170, and the zoom late demand unit 172. As shown in FIG.
The focus operation of this type of TV camera 100 is performed by attaching a focus operation unit (focus demand) 170 to a pan / tilt rod not shown, an L-shaped angle member fixed to the camera, and the like. Is performed by a photographer operating the camera. The focus demand 170 is connected to the television lens 100 via a cable 174, and an operation signal output from the focus demand 170 is passed through the circuit board 28 shown in FIG. It is added to a servo module (not shown) for driving the assembled focus lens.
[0050]
The servo module drives the built-in servo motor based on the input control signal, and transmits the driving force to the connected lens body via the coupling. The driving force transmitted to the lens body is transmitted to the focus lens group by a power transmission mechanism (not shown) provided in the lens body, and drives the focus lens group. Thus, focus adjustment is performed.
[0051]
On the other hand, the zoom operation is performed by the cameraman turning the thumb ring 176 of the zoom late demand unit 172 attached to the grip of the pan / tilt bar.
The zoom rate demand unit 172 is connected to the television lens 100 via a cable 174, and outputs a driving signal of a zoom direction and a zoom speed according to the rotation direction and angle of the thumb ring 176 to the lens side. The drive signal is applied to a servo module (not shown) for driving a zoom lens that is assembled in a recess at the bottom of the lens body 10 via the circuit board 28 shown in FIG. As with the focus lens driving servo module, the zoom lens driving servo module also drives a built-in servo motor based on an input control signal, and the driving force is coupled via a coupling to the lens body side. Communicate to. The driving force transmitted to the lens body 10 is transmitted to the zoom lens by a power transmission mechanism (not shown) provided in the lens body 10 to drive the zoom lens group. Thus, zoom adjustment is performed.
[0052]
FIG. 13 is a partial cross-sectional view showing the internal structure of the connector portion 180 of the connection cable 174 that connects the television lens 100 shown in FIG. 12 with the focus demand 170 and the zoom rate demand unit 172.
In the connection cable 174, the lead wire bundle that transmits the zoom drive signal or the focus drive signal is covered with a metal mesh-like shield covered wire (mesh wire) 182. Each lead wire passes through a metal cylinder 184 of the connector and is connected to a predetermined connector pin. The shield covered wire 182 has the inner peripheral surface at the end of the shield covered wire brought into surface contact with the outer peripheral surface of the metal tube (shield covered wire connecting portion) 184, and the entire periphery thereof is soldered and connected. As a result, the periphery of the lead wire is surrounded by the metal tube 184 and the shield covered wire 182 without breaks, and electrical contact between the shield covered wire 182 and the metal tube 184 is increased, thereby strengthening the shield. The periphery of the metal tube 184 and the shield covered wire 182 is fixed with an insulating material 185 such as resin.
[0053]
As shown in FIG. 14, in the conventional connector, the end portions 182A of the shield covered wires 182 are gathered together and soldered to one place (P) of the outer peripheral surface of the metal tube 186. The end portion 188 is not covered with a shield, and there is a possibility that unnecessary radiation noise may be mixed.
On the other hand, as shown in FIG. 13, the shield of the cable is reinforced by soldering the shield covered wire 182 of the connector part over the entire outer peripheral surface of the metal tube 184. The shield covered wire 182 is most effective to be soldered to the entire outer peripheral surface of the metal tube 184 without interruption. However, even when soldering at several locations along the outer peripheral surface, Depending on the density, appropriate effects are recognized. Further, the joining of the shield covered wire 182 and the metal tube 184 is not limited to soldering, and in order to reduce unnecessary radiation noise, the contact surface area between the shield covered wire 182 and the metal tube 184 is as large as possible ( Both may be joined while desirably contacting all around.
[0054]
The connection cable having the structure shown in FIG. 13 is not limited to the connection between the TV lens 100, the focus demand 170, and the zoom rate demand unit 172, but the connection between the TV lens 100 and the extender switching controller 160 or the iris controller 162, or the extender switching controller. By using this when connecting the TV lens main body and the respective control devices that control the TV lens body, such as a connection between the I / S controller 160 and the iris controller 162, it is possible to prevent unwanted radiation noise from entering the TV lens.
[0056]
【The invention's effect】
As described above, according to the television lens of the present invention.A first control device for controlling one of a focus lens group, a zoom lens group, an iris, and an extender of the television lens is connected to the television lens via a multi-core first cable; A second control device for controlling another one different from the first control device is connected to the control device by a second cable, and a second signal output from the second control device is connected to the first control device. When the relay device is relayed by the control device and guided to the television lens through the first cable, an annular unnecessary radiation noise removing member is provided in the casing of the first control device, and the first and second cables are provided. Is passed through the annular unnecessary radiation noise removing member, so that unnecessary radiation noise superimposed on the first and second cables can be effectively removed. Therefore, such unnecessary radiation noise is not guided into the television lens, and it is possible to prevent a malfunction that causes malfunction due to noise mixed in various control signals of the television lens. Further, by passing the first and second cables through one annular unnecessary radiation noise removing member, space saving can be achieved as compared with the case where the ferrite cores are individually fixed to the first and second cables. In addition, cost reduction can be achieved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a lens body of an EFP lens to which a television lens according to the present invention is applied.
FIG. 2 is a perspective view of a cover covering a lens body.
FIG. 3 is an enlarged view of the vicinity of the feedthrough capacitor.
FIG. 4 is a block diagram showing a part to which a feedthrough capacitor is applied.
FIG. 5 is an explanatory view showing the structure of a battery connector and a connector receptacle;
6 is a view showing a state in which a battery connector is connected to the connector receiver shown in FIG. 5;
FIG. 7 is an enlarged view showing a configuration of an indicator display unit provided on a side surface of the mount frame.
FIG. 8 is a diagram showing an example of an indicator plate
9 is an exploded perspective view of the extender switching knob shown in FIG. 1. FIG.
FIG. 10 is an exploded perspective view of an extender switching knob provided on a side portion of the mount frame.
FIG. 11 is an explanatory diagram showing the arrangement relationship of ferrite in the extender switching controller;
FIG. 12 is a perspective view showing a connection relationship between a television lens, a focus demand, and a zoom late demand.
13 is a partial cross-sectional view showing the internal structure of the cable connector shown in FIG.
FIG. 14 is a partial sectional view showing an internal structure of a conventional cable connector.
[Explanation of symbols]
10. Lens body
14 ... Lens barrel
16 ... Body bottom plate
18 ... Mount frame
54 ... Signal line
56 ... Ferrite core
57, 58 ... Signal bundle
100 ... TV lens
160 ... Extender switching controller
162 ... Iris controller
164 ... Multi-core cable (first cable)
166 ... Iris control signal line cable (second cable)

Claims (1)

Is connected via a first cable of the television lens and the multi-core, the focus lens group of the television lens, a zoom lens group, an iris, and a first for outputting a first signal for controlling at least one extender sac Chino of a control device, wherein the first controller and the second is connected via a cable focusing lens group of the television lens, a zoom lens group, an iris, and extender sac Chino second controlling other one A second control device that outputs a signal, relays the second signal output from the second control device by the first control device, and the first control together with the first signal. In a television lens configured to lead from a device to the television lens via the first cable,
In the casing of the first control device, an annular unnecessary radiation noise removing member through which the first cable and the second cable are inserted is provided, and high-frequency noise superimposed on the first cable and the second cable TV lens characterized by reducing

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