JP2013182693A - Camera cable and creation method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera cable capable of downsizing a head part of a head separation type imaging apparatus and to provide a creation method of the same.SOLUTION: The camera cable comprises: a coaxial cable; a shield conductor for covering the coaxial cable; an insulating coating for covering the shield conductor; and a conductor wire which is a separate member from the shield conductor and electrically connected to the shield conductor.

Description

  Embodiments of the present invention relate to a camera cable used in a head-separated imaging apparatus in which a head unit that images a subject and a main body unit that processes an image signal transmitted from the head unit are separated, and a method for creating the camera cable About.

  A conventional imaging apparatus includes a head unit having an imaging element (for example, a charge coupled device (CCD) image sensor or a complementary metal oxide semiconductor (CMOS) image sensor), and a main body that processes an image signal transmitted from the head unit. There is a head-separated type imaging device in which a part is separated. In a head-separated type imaging apparatus, a head unit and a main unit are connected by a camera cable, and data is transmitted and received between the head unit and the main unit through the camera cable. Conventionally, various cables have been proposed for such data transmission / reception.

JP 2010-40214 A JP 2006-41766 A JP 2006-128792 A

  In recent years, there has been a demand for downsizing of a head portion of a head-separated type imaging apparatus. For this reason, it is required to make the camera cable thinner in accordance with the miniaturized head portion. In particular, in the field of endoscope apparatuses, there is a strong demand for downsizing the head portion and thinning the camera cable.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a camera cable and a method for producing the camera cable that can reduce the size of the head portion.

  The camera cable according to the embodiment is a separate member from the coaxial cable, the shield conductor covering the coaxial cable, the insulating film covering the shield conductor, and the shield conductor. An electrically connected conductor wire.

  According to the present invention, the head portion can be reduced in size.

1 is a configuration diagram of an imaging apparatus according to an embodiment. FIG. 3 is a layout diagram in the head unit according to the embodiment. The block diagram of the camera cable which concerns on embodiment. The connection diagram of the camera cable according to the embodiment. The connection diagram of the camera cable according to the embodiment. The connection diagram of the camera cable according to the embodiment. The block diagram of the camera cable which concerns on the modification of embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings.
(Embodiment)
FIG. 1 is a configuration diagram of an imaging apparatus 100 (hereinafter referred to as an imaging apparatus 100) according to an embodiment. The imaging apparatus 100 includes a head unit 200, a CCU (Camera Control Unit) 300 (hereinafter referred to as a main body unit 300), and a camera cable 400 that connects the head unit 200 and the main body unit 300.

  The head unit 200 includes an image sensor 201, a TAB (Tape Automated Bonding) 202, a wiring board 203, and a pedestal 204. The image sensor 201 is a solid-state image sensor, for example, a CMOS (Complementary Metal Oxide Semiconductor) image sensor or a CCD (Charge Coupled Device) image sensor.

  The TAB 202 is connected to the image sensor 201 via bumps by forming a circuit on a heat resistant film by etching.

  The wiring board 203 is a board for connecting the terminal of the TAB 202 and the wiring of the camera cable 400. Some of the terminals of the TAB 202 are fixed on the pedestal 204 and the wiring board 203, and some of them are connected to the terminals of the wiring board 203.

  On the pedestal 204, an image sensor 201, a TAB 202, and a wiring board 203 are arranged.

  The main body unit 300 includes an IF circuit 301, a memory 302, a processor 303, a driver 304, a controller 305, and a power supply circuit 306.

  The IF circuit 301 is an interface for transmitting and receiving control signals and data to and from the head unit 200.

  The memory 302 is a nonvolatile memory, and is, for example, a serial EEPROM (Electrically Erasable Programmable Read-Only Memory). The memory 302 stores setting data (operation mode) and correction data for the head unit 200.

  The processor 303 is a processor for image processing. The processor 303 performs various corrections (for example, noise correction, white balance, γ correction, etc.) on the image signal transmitted from the head unit 200. The processor 303 outputs the corrected image signal to an external display device 500A (for example, a CRT (Cathode Ray Tube) or a liquid crystal monitor).

  The driver 304 is a drive circuit for the image sensor 201. The driver 304 changes the driving method and the frame rate of the image sensor 201 based on the control from the controller 305. The driver 304 outputs a pulse signal (for example, a pulse signal for vertical synchronization or horizontal synchronization (transfer pulse signal, reset gate pulse signal)) to the image sensor 201.

  The controller 305 reads correction data and setting data from the memory 302. The controller 305 controls the processor 303 and the driver 304 based on the read correction data and setting data.

  The power supply circuit 306 is connected to an external power supply. The power supply circuit 306 converts electric power from the external power supply into a predetermined voltage and supplies it to the constituent circuits (IF circuit 301, memory 302, processor 303, driver 304, controller 305) of the main body 300. Further, power from the power supply circuit 306 is also supplied to the head unit 200 via the camera cable 400.

(Configuration in the head unit 200)
FIG. 2 is a layout view inside the head unit 200. FIG. 2A is a side view inside the head unit 200. FIG. 2B is a plan view (front side) inside the head unit 200. FIG. 2C is a plan view (back side) inside the head unit 200. Hereinafter, the configuration of the head unit 200 will be described with reference to FIG. In the following description, the side on which the wiring board 203 is disposed will be described as the front side, and the side on which the wiring board 203 is not disposed will be described as the back side.

  The image sensor 201 is disposed on the end surface 204 </ b> A of the pedestal 204 of the head unit 200. The image sensor 201 is mounted on the TAB 202. Of the terminals of the TAB 202 connected to the image sensor 201 via bumps, the terminals 202A to 202E are arranged on the front side of the pedestal 204. Further, the terminals 202F to 202J are disposed on the back side of the pedestal 204.

  The terminal 202A is a terminal for inputting a high-speed pulse signal (transfer pulse signal) for horizontal synchronization to the image sensor 201. The terminal 202B is a terminal for supplying power to the image sensor 201. The terminal 202C is a terminal for outputting a video signal from the image sensor 201. The terminal 202D is a terminal for inputting a high-speed pulse signal (reset gate pulse signal) for horizontal synchronization to the image sensor 201. The terminal 202E is a ground (GND) terminal for the image sensor 201. Terminals 202F to 202I are terminals for inputting a pulse signal for vertical synchronization to the image sensor 201. The terminal 202J is a terminal for applying a bias voltage.

  Terminals 203 </ b> A to 203 </ b> C are formed on the wiring board 203. The terminal 203A is a video signal input terminal and is connected to the terminal 202C of the TAB 202. The terminal 203B is a video signal output terminal, and is connected to the terminal 203A in the wiring board 203. The terminal 203C is a terminal for grounding (GND).

(Configuration of camera cable 400)
FIG. 3 is a configuration diagram of the camera cable 400. 4 to 6 are diagrams in which the cables 410 to 440 and 500 to 540 of the camera cable 400 are connected to the terminals of the TAB 202 and the wiring board 203. 4 to 6 are a side view, a plan view (front side), and a plan view (back side), respectively. Hereinafter, the configuration and connection destination of the camera cable 400 will be described with reference to FIGS.

  The camera cable 400 covers the coaxial cables 410 and 420, the cables 430 to 440 and 500 to 540, the shield conductor 460 that covers the coaxial cables 410 and 420, the cables 430 to 440, and 500 to 540, and the shield conductor 460. An outer jacket 470 (hereinafter referred to as an insulating coating 470), a conductor wire 480 electrically connected to the shield conductor 460, and a caulking ring 490 are provided.

  The coaxial cable 410 includes an inner conductor 411 that transmits a pulse signal (transfer pulse signal) for horizontal synchronization, an insulating film 412 that covers the inner conductor 411, and a braided copper wire 413 that covers the insulating film 412 (hereinafter referred to as an outer conductor 413). And a protective coating 414 that covers the outer conductor 413. The inner conductor 411 of the coaxial cable 410 is connected to the terminal 202A of the TAB 202. The outer conductor 413 of the coaxial cable 410 is fixed on the shield conductor 460 by a conductor wire 480.

  The coaxial cable 420 includes an inner conductor 421 that transmits a pulse signal for horizontal synchronization (reset gate pulse signal), an insulating film 422 that covers the inner conductor 421, and a braided copper wire 423 that covers the insulating film 422 (hereinafter referred to as an outer conductor). 423) and a protective film 424 that covers the outer conductor 423. The inner conductor 421 of the coaxial cable 420 is connected to the terminal 202D of the TAB 202. The outer conductor 423 of the coaxial cable 420 is fixed on the shield conductor 460 by a conductor wire 480.

  In a conventional camera cable, a GND terminal that is different for each coaxial cable is provided on the wiring board. The outer conductor of the coaxial cable is connected to a different GND terminal for each coaxial cable.

  In this embodiment, the outer conductors 413 and 423 of the coaxial cables 410 and 420 are electrically connected to the shield conductor 460, respectively. For this reason, it is not necessary to provide the GND terminal for coaxial cables in the wiring board 203. FIG. As a result, the number of terminals provided on the wiring board 203 can be reduced, and the wiring board 203 can be made smaller. For this reason, the head part 200 can be reduced in size.

  The cable 430 is a cable that transmits power supplied from the power supply circuit 306 of the main body 300. The cable 430 includes a conductive metal wire 431 and an insulating coating 432 that covers the metal wire 431. The metal wire 431 of the cable 430 is connected to the terminal 202B of the TAB 202.

  The cable 440 is a cable that transmits a video signal output from the image sensor 201 to the main body 300. The cable 440 includes a conductive metal wire 441 and an insulating coating 442 that covers the metal wire 441. The metal wire 441 of the cable 440 is connected to the terminal 203 </ b> B of the wiring board 203.

  Cables 500 to 530 are cables that transmit a pulse signal for vertical synchronization to the image sensor 201. Each of the cables 500 to 530 includes conductive metal wires 501 to 531 and insulating coatings 502 to 532 that respectively cover the metal wires 501 to 531. The metal wires 501 to 531 of the cables 500 to 530 are connected to the terminals 202F to 202H of the TAB 202, respectively.

  The cable 540 is a cable for applying a bias voltage. The cable 540 includes a conductive metal wire 541 and an insulating film 542 that covers the metal wire 541. The metal wire 541 of the cable 540 is connected to the terminal 202I of the TAB 202.

  The shield conductor 460 is a braided shield formed by braiding a thin metal wire (for example, a copper wire) called a braided wire. Note that a metal foil may be used as the shield conductor 460 in the case where it is desired to reduce attenuation at precision measurement or at a frequency of ultra-high frequency or higher. The shield conductor 460 is connected (grounded) to GND on the main body 300 side.

  The insulating coating 470 is made of an insulator (for example, polyethylene).

  The conductor wire 480 is a conductive fine metal wire having a diameter of 20 μm to 30 μm. The conductor wire 480 has one end 480A connected to the terminal 202E of the TAB 202 and the other end 480B connected to the terminal 203C of the wiring board 203. The conductor wire 480 is wound around the shield conductor 460 and fixed. At this time, the outer conductors 413 and 423 of the coaxial cables 410 and 420 are also fixed on the shield conductor 460.

  In the conventional camera cable, the wiring formed by twisting a plurality of braided wires constituting the shield conductor 460 is connected to the GND terminal provided on the wiring board. However, in this method, the wiring for connecting the shield conductor 460 to the GND terminal of the wiring board 203 becomes thick. For this reason, it is necessary to widen the GND terminal of the wiring board 203 as well.

  In this embodiment, a conductor wire 480, which is a member different from the shield conductor 460, is prepared, and this conductor wire 480 is connected to the terminal 203C of the wiring board 203. Therefore, the width of the terminal 203C of the wiring board 203 is made larger than before. Can be narrowed. As a result, the width of the wiring board 203 can be reduced, and the wiring board 203 can be reduced. For this reason, the head part 200 can be reduced in size. In addition, since the wiring drawn out from the shield conductor 460 can be thinned, the camera cable 400 can be thinned.

  The caulking ring 490 is a conductive metal ring (for example, a copper ring). The caulking ring 490 fixes the conductor wire 480 and the outer conductors 413 and 423 of the coaxial cables 410 and 420 while being wound around the shield conductor 460.

  In place of the caulking ring 490, each of the conductor wire 480 and the coaxial cables 410 and 420 using a conductive adhesive (adhesive added with conductive metal (for example, silver) powder) is used. The outer conductors 413 and 423 may be fixed while being wound around the shield conductor 406. Further, the caulking ring 490 and the conductive adhesive may be used together to fix the outer conductors 413 and 423 of the conductor wire 480 and the coaxial cables 410 and 420 while being wound around the shield conductor 460.

(Creation of camera cable 400)
Next, creation and connection of the camera cable 400 will be described.
First, a camera cable 400 in which a plurality of coaxial cables 410 and 420 and a plurality of cables 430 to 440 and 500 to 540 are covered with a braided shield 460 (shield conductor 460) and a jacket jacket 470 (insulating coating 470) is provided. prepare.

  Next, the insulation coating 470 and the shield conductor 460 on one end side (head portion 200 side) of the camera cable 400 are peeled off to expose the cables 410 to 440 and 500 to 540.

  Further, the insulation coatings 412 and 422, the braided copper wires 413 and 423 (outer conductors 413 and 423) and the protective coatings 414 and 424 of the coaxial cables 410 and 420 are peeled off, and the inner conductor 411 of the coaxial cables 410 and 420 is removed. 421, insulating coatings 412 and 422, and outer conductors 413 and 423 are exposed.

  Next, the insulation coatings 432 to 442 and 502 to 542 of the cables 430 to 440 and 500 to 540 are peeled to expose a part of the metal wires 431 to 441 and 501 to 541 of the cables 430 to 440 and 500 to 540.

  A part (about several) of the braided wires constituting the braided copper wires 413 and 423 of the coaxial cables 410 and 420 is twisted and processed into a cable shape.

  Next, a conductor wire 480 that is a thin metal wire having a diameter of 20 μm to 30 μm is wound around the shield conductor 460 of the camera cable 400. During this winding, the outer conductors 413 and 423 processed into a cable shape are also fixed on the shield conductor 460 using the conductor wire 480.

  Next, the portions around which the outer conductors 413 and 423 and the conductor wire 480 of the coaxial cables 410 and 420 are wound are caulked with a caulking ring 490, and the outer conductors 413 and 423 and the conductor wire 480 of the coaxial cables 410 and 420 are connected to the shield conductor 460. Fix in the wound state.

  Instead of the caulking ring 490, the outer conductors 413 and 423 and the conductor wire 480 of the coaxial cables 410 and 420 may be fixed using a conductive adhesive. Further, the caulking ring 490 and the conductive adhesive may be used together to fix the outer conductors 413 and 423 and the conductor wire 480 of the coaxial cables 410 and 420.

  Next, the inner conductor 411 of the coaxial cable 410 is soldered to the terminal 202A of the TAB 202. Also, the inner conductor 421 of the coaxial cable 420 is soldered to the terminal 202D of the TAB 202.

  Next, the metal wire 431 of the cable 430 is soldered to the terminal 202B of the TAB 202. Next, the metal wire 441 of the cable 440 is soldered to the terminal 203 </ b> B of the wiring board 203. Next, the metal wires 501 to 541 of the cables 500 to 540 are soldered to the terminals 202F to 202I of the TAB 202, respectively. Finally, one end 480A of the conductor wire 480 is soldered to the terminal 202E of the TAB 202, and the other end 480B is soldered to the terminal 203C of the wiring board 203.

  As described above, the camera cable according to the embodiment prepares the conductor wire 480 that is a member different from the shield conductor 460 and connects the conductor wire 480 to the terminal 203 </ b> C of the wiring board 203. The width of the terminal 203C can be made narrower than before. As a result, the width of the wiring board 203 can be reduced, and the wiring board 203 can be reduced. For this reason, the head part 200 can be reduced in size.

  In addition, it is not necessary to twist the braided wire constituting the shield conductor 460 and process it into a cable shape, and only the conductor wire 480 is wound around the shield conductor 460, so that the workability when creating the camera cable 400 can be improved. it can. Furthermore, it is possible to reduce the possibility that the braided wire processed into a cable shape is frayed and short-circuited with other wiring.

  Further, the respective outer conductors 413 and 423 of the coaxial cables 410 and 420 are electrically connected to the shield conductor 460. For this reason, it is not necessary to provide the GND terminal for coaxial cables in the wiring board 203. FIG. As a result, the number of terminals provided on the wiring board 203 can be reduced, and the wiring board 203 can be made smaller. For this reason, the head part 200 can be reduced in size. Moreover, the workability at the time of pulling out the cable by peeling off the shield conductor 460 and the jacket (insulation coating) 470 of the camera cable 400 is improved.

(Modification of the embodiment)
In the above embodiment, when the conductor wire 480 is wound around the shield conductor 460, the outer conductors 413 and 423 processed into a cable shape are also fixed on the shield conductor 460 using the conductor wire 480. The outer conductors 413 and 423 processed in this manner may be wound around the shield conductor 460 and fixed.

  Further, as shown in FIG. 7, the conductor wire 480 may be tied to the shield conductor 460 and fixed instead of being wound around the shield conductor 460. The outer conductors 413 and 423 processed into a cable shape may also be connected to the shield conductor 460 and fixed.

  Further, the conductor wire 480 may be accommodated in the shield conductor 460. By accommodating the conductor wire 480 in the shield conductor 460, the conductor wire 480 is fixed in the shield conductor 460. For this reason, the operation | work which winds the conductor wire 480 to the shield conductor 460, or tied can be abbreviate | omitted, and workability | operativity improves.

  Further, the cables 500 to 530 that transmit the pulse signal for vertical synchronization to the image sensor 201 may be coaxial cables. Also in this case, by electrically connecting the outer conductors of the cables 500 to 530 to the shield conductor 460, it is not necessary to provide the GND terminals for the cables 500 to 530 on the wiring board 203, thereby reducing the size of the head unit 200. be able to.

(Other embodiments)
As mentioned above, although several embodiment of this invention was described, the said embodiment is shown as an example and is not intending limiting the range of invention. The above embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. For example, the imaging apparatus described in the embodiment can be applied to an endoscope apparatus. These embodiments and modifications are included in the invention described in the claims and the equivalents thereof as well as included in the scope and gist of the invention.

  DESCRIPTION OF SYMBOLS 100 ... Imaging device, 200 ... Head part, 201 ... Image sensor, 202 ... TAB, 202A-202F ... Terminal, 203 ... Wiring board, 203A-203C ... Terminal, 204 ... Base, 204A ... End surface, 300 ... Body part, 301 ... IF circuit, 302 ... memory, 303 ... processor, 304 ... driver, 305 ... controller, 306 ... power supply circuit, 400 ... camera cable, 406 ... shield conductor, 410,420 ... coaxial cable, 411,421 ... internal conductor, 412 , 422 ... Insulating coating, 413, 423 ... External conductor, 413, 423 ... Braided copper wire, 414, 424 ... Protective coating, 430-440, 500-540 ... Cable, 431-441, 501-541 ... Metal wire, 432 ˜442, 502 to 542… insulating coating, 460 ... shield conductor, 470 ... outside Jacket (insulating film), 480 ... conductor wire, 490 ... caulking ring, 500A ... display device.

Claims (10)

Coaxial cable,
A shield conductor covering the coaxial cable;
An insulating coating covering the shield conductor;
The shield conductor is a separate member, and a conductor wire electrically connected to the shield conductor;
With camera cable.   The camera cable according to claim 1, wherein the conductor wire is wound around the shield conductor.   The camera cable according to claim 1, wherein an outer conductor of the coaxial cable is electrically connected to the shield conductor.   The camera cable according to claim 3, wherein an outer conductor of the coaxial cable is wound around the shield conductor.   The camera cable according to claim 1, wherein the conductor wire is fixed to the shield conductor with a conductive adhesive.   The camera cable according to claim 4, wherein an outer conductor of the coaxial cable is fixed to the shield conductor with a conductive adhesive.   The camera cable according to any one of claims 1 to 6, further comprising a caulking ring that fixes at least one of the conductor wire or the outer conductor of the coaxial cable to the shield conductor.   A coaxial cable, a shield conductor that covers the coaxial cable, an insulating film that covers the shield conductor, and a conductor wire that is a separate member from the shield conductor and is electrically connected to the shield conductor. A method for producing a camera cable, comprising the step of winding the conductor wire around the shield conductor of the camera cable and fixing the outer conductor of the coaxial cable.   The method for producing a camera cable according to claim 8, further comprising a step of fixing at least one of the conductor wire or the outer conductor of the coaxial cable to the shield conductor using a conductive adhesive.   The method for producing a camera cable according to claim 8 or 9, further comprising a step of fixing at least one of the conductor wire or the outer conductor of the coaxial cable to the shield conductor using a caulking ring.

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