CN1064774C

CN1064774C - Optical pickup device

Info

Publication number: CN1064774C
Application number: CN95118275A
Authority: CN
Inventors: 吉永千佳士; 中里康弘; 大久保辰夫; 佐野正二
Original assignee: Sanyo Electric Co Ltd
Current assignee: Sanyo Electric Co Ltd
Priority date: 1994-11-29
Filing date: 1995-11-10
Publication date: 2001-04-18
Anticipated expiration: 2015-11-10
Also published as: CN1139262A; JPH08153333A; KR960019137A; KR100420906B1

Abstract

To dissolve the problem such as that a foldback loop of transmission cable is brought into contact with a signal recording medium. By the structure to foldback an optical axis of the optical beam passing through an objective lens 7 by a reflecting mirror 5, a space 17 is secured on the side of a mechanism driving an objective lens on the mounting surface whereto the moving mechanism of objective lens 7 of an optical housing 1 is mounted. A connector 19 is arranged in the space 17 for relaying the electrical connection with a circuit board at the side of the device main body.

Description

Optic pick-up

The present invention relates to the optic pick-up of the information of picking up from the signal surface of signal record medium; Particularly relate to a kind of like this optic pick-up, this device comprises an optics box body, this box body is installed in the information recording/reproducer and can be contained in the direction associated movement of the signal surface of the signal record medium in this information recording/reproducer with an object lens edge, have a connector that is used for the web member on socket cable one end on this optics box body, the information that this root cable is used for picking up from above-mentioned information sides by the light beam that passes object lens is sent to the signal processing of information recording/reproducer.

Optic pick-up utilizes light the signal surface as a CD of signal record medium to be read or write the operation of information.In order to realize read/write to information, this optic pick-up generally comprises a laser diode and an optical detector, this laser diode sends a branch of light, make it pass object lens and focus on the signal surface, and the Beam Transformation that optical detector is used for reflecting and to pass object lens from signal surface becomes electric signal.The transmission cable that is used for the transmission of supply of electrical energy and signal is connected to laser diode and optical detector the circuit board of information recording/reproducer.

In such optic pick-up, an end of cable is linked on the light pick-up circuit by an electrical connector.According to this structure, need not to change the type of electrical connector by the type that changes transmission cable, an optic pick-up just can be connected with the information recording/reproducer of all size.

Traditional, as shown in Figure 7, in this optic pick-up, the connector 104 of the web member on transmission cable 103 1 ends is used to peg graft, because the shape of direction of motion 102 and optic pick-up 101 generally is contained on the plane perpendicular to the direction of motion 102 of optic pick-up.And owing to the signal surface 106 of the web member on transmission cable 103 1 ends from signal record medium 105 inserts the connector 104 with downward direction, so the loop of cable 103 is towards signal record medium 105.

Soft wiring plate (flexible wiring board), promptly a kind of according to of the lip-deep wiring of wiring pattern cloth, through being commonly used for transmission cable at one deck polyester film.The use of this soft wiring plate has this defective, promptly when optic pick-up shifts near place's of being connected to each other (promptly shifting to the left among Fig. 7) of the circuit board and the transmission cable of information recording/reproducer, because the flexibility of soft wiring plate is not good especially, the loop of flexible distributing board tends to contact with the signal surface of signal record medium.Therefore, in existing technology, be placed with a limiting plate in the front of signal record medium, the loop of wiring plate is resisted against on this piece plate, takes this, and has prevented contacting of this loop and signal record medium.

The objective of the invention is to propose a kind of optic pick-up, wherein, the loop of transmission cable both made circuit board when this device be by electrical connector be connected with transmission cable the time can not contact with the signal surface of signal record medium yet.

The present invention at first proposes a kind of optic pick-up, it comprises that one is contained in the information recording/reproducing apparatus, can be along signal surface and optics box body that object lens together move of the signal record medium that is contained in this information recording/reproducing apparatus, has a connector on the described box body, web member on transmission cable one end is inserted in this connector, this transmission cable is used for the signal processing of giving described information recording/reproducing apparatus with the information transmission that the light beam by object lens picks up from described signal surface, it is characterized in that, described connector is installed on the optics box body along the direction of the described signal surface of described signal record medium, and the web member on described transmission cable one end is inserted in the described connector along the direction of the described signal surface of described signal record medium.

Utilize said structure, when the optics box body when above-mentioned signal surface moves, the signal surface of signal record medium just can not run in the loop of transmission cable.The result is, needn't handle especially transmission cable, so manufacturing process simple, cost has reduced and the reliability of signal regeneration has improved.

And, according to a second aspect of the invention, in described device, in the described optics box body optical system is housed, described optical system comprises and is used for deflection and comes from the catoptron and the optical detector that be used for Beam Transformation from described catoptron become electric signal of described object lens along the light beam of described signal surface direction; Described connector is positioned at the upper surface of the cover plate that is used to cover described optical system.

Utilize this structure, the installation of connector can not increase the general thickness of optic pick-up.

According to a third aspect of the present invention, as to the replenishing of first aspect, described device further comprises and is used for and will becomes from optical detectors of beam direction of described object lens with the optical system that transforms the light beam into electronic information signal be used for the light beam from object lens is focused on the signal surface of signal record medium and make the object lens driving mechanism of the signal track that described light beam can the tracking signal recording medium; Described optical system and described driving mechanism are positioned at adjacent to each other along on the plane of described signal surface, and described connector is positioned at the upper surface of the cover plate that is used to cover described optical system.

Utilize said structure, the installation of connector can not increase the general thickness of optic pick-up.

The advantage of above-mentioned purpose of the present invention, feature will be from below in conjunction with becoming clearer the description of accompanying drawing to embodiment.

Fig. 1 is the planimetric map of optic pick-up of the present invention.

Fig. 2 is a partial sectional view, shows the optical system in the above-mentioned optic pick-up.

Fig. 3 is the parts three-dimensional exploded view of optic pick-up.

Fig. 4 is a side view of seeing optic pick-up in the past along the direction of arrow among Fig. 14.

Fig. 5 is a side view of CD player, is used to explain the course of work of optic pick-up.

Fig. 6 is another side view of CD player, is used to continue to explain the course of work of optic pick-up.

Fig. 7 is a side view of CD player, is used to explain the course of work of conventional optical pick-up device.

Below in conjunction with accompanying drawing, describe the present invention.

Fig. 1 shows the optic pick-up of first embodiment according to the invention.This optic pick-up for example comprises an optics box body 11, this box body 11 is contained in for example (not shown) in the CD player of an information recording/reproducing apparatus, and can along be contained in this information recording/reproducing apparatus signal record medium for example the signal surface of CD (not shown) move.One object lens 12 are arranged in the box body 11 and towards the signal surface of signal record medium.These object lens 12 can focus on light beam on the signal surface of signal record medium.And the light beam that is reflected by signal surface (enters the paper of Fig. 1) in the opposite direction again by object lens 12.

Object lens 12 are supported by a framework 14 that object lens driving mechanism 13 is housed, and this driving mechanism 13 is used to make the light beam that comes from object lens 12 to focus on the signal surface of signal record medium and makes the bars track of light beam on can the tracking signal recording medium.Driving mechanism 13 and framework 14 are contained in the box body 11 in the lump.On framework 14 next doors, be a connector 15 that is contained on the box body 11, the web member on the end of transmission cable can be inserted in this connector 15.The information signal that is picked up from signal surface by the light beam by object lens 12 utilizes this transmission cable to deliver to the signal processing of CD player.As will be described below, the web member on the end of transmission cable is that the direction along the signal surface of signal record medium is inserted in the connector 15.Connector 15 is arranged on the upper surface of the cover plate 16 that is contained in box body 11, and cover plate 16 and box body 11 define one jointly and be used for splendid attire and will become the space of the optical system 17 of electric signal from the Beam Transformation of object lens 12.

Optical system 17 comprises the laser diode 18 that goes out the beam of laser light beam as light emitted, as shown in Figure 2.The laser beam that is sent by laser diode 18 passes a diffraction grating 19, and is split into a main spot and a side spot that is used for tracking Control that is used for information signal.The laser beam that passes diffraction grating 19 is after comprising plane-parallel half-mirror 20 reflections, and its optical axis can pass object lens by 90 ° of catoptron 21 deflections that are positioned under the object lens 12 thereby promptly become along the direction light beam perpendicular to signal surface.Pass object lens 12 once more through modulation of the signal surface of signal record medium and the laser beam that reflects, and by catoptron 21 again to be deflected into direction along signal surface.Laser beam after the deflection passes half-mirror 20 then, and the astigmatism that is used to focus on produces, and optical detector 22 becomes electronic information signal with this Beam Transformation.

As shown in Figure 3, laser diode 18 is installed on the box body 11 by pressure plare 23 usefulness screws.Detector 22 is welded on the circuit board 24 by eutectic welding, and detector 22 also is to be installed on the box body 11 by screw by a pressure plare 25.Lens drive system 13 comprises a lens carrier 27, and this support is suspended on spiral shell by electric wire 26 (Fig. 1) and is contained on the framework 14 on the box body 11.Be fixed on magnetic circuit 28 on the framework 14 and be positioned at the middle section of support 27.The drive coil 29 that includes focusing coil and tracking coil is fixed on the support 27 and is in the magnetic field that is produced by magnetic circuit 28.Take this, the focus control of object lens 12 and tracking Control flow through the electric current of drive coil 29 by adjustment, can be regulated.Should be noted that object lens 12 are connected at the periphery place of support 27 on the support 27 and should periphery round magnetic circuit 28 and drive coil 29.Therefore, object lens 12 are by the top of the catoptron 21 of optical system 17 that framework 14 supports and is positioned at that object lens driving mechanism 13 is housed.

Connector 15 is positioned at and is fixed on spiral shell and is contained on the first flexible cord plate 30 of the cover plate 16 on the box body 11, and its end pin by eutectic welding on the weld zone of the first flexible cord plate 30.Plate 30 links to each other with laser detector 22 with laser diode 18.

Shown in device among Fig. 4, connector 15 is located immediately at the cover plate 16 that is used to cover optical system 17.Therefore such installation does not increase the general thickness of optic pick-up 10.The optical system 17 that is used for becoming electric signal from the Beam Transformation of object lens 12 with focus the light beam in signal record medium and make light beam can be adjacently located on plane along the object lens driving mechanism 13 of the signal track of signal record medium along signal surface.In addition, because lens 12 are positioned on the optical system 17, the increase of the general thickness of optic pick-up 10 has been prevented effectively.

The course of work of present embodiment is described below.At first, the optic pick-up in the present embodiment 10 is contained on the guide shaft 41 of CD player 40 as shown in Figure 5 slidably.Optic pick-up 10 therefore can be along the radial motion of the CD 43 that is rotated by alternation of hosts's spindle motor 42.Extend out the circuit board 44 of the second flexible cord plate 45 on being contained in CD player 40 as transmission cable, and be connected on the optic pick-up 10.As can understanding from Fig. 3, the web member on the second flexible cord plate, 45 1 ends is that the direction along the signal surface of CD 43 is inserted in the connector 15 of optic pick-up 10.Therefore, the loop 45a of the second flexible cord plate 45 extends along the direction of the signal surface of CD 43.Utilize this structure, as shown in Figure 6, when both having made on optic pick-up 10 moves near the circuit board 44 of CD player 40 and the second flexible cord plate, 45 positions connected to one another, the contacting of signal surface of the flexible cord plate 45 that causes because of stretching out of the loop 45a of flexible cord plate 45 and CD 43 can not taken place yet.

Claims

1, a kind of optic pick-up, it comprises that one is contained in the information recording/reproducing apparatus, can be along signal surface and optics box body that object lens together move of the signal record medium that is contained in this information recording/reproducing apparatus, has a connector on the described box body, web member on transmission cable one end is inserted in this connector, this transmission cable is used for the signal processing of giving described information recording/reproducing apparatus with the information transmission that the light beam by object lens picks up from described signal surface, it is characterized in that

Described connector is installed on the optics box body along the direction of the described signal surface of described signal record medium, and the web member on described transmission cable one end is inserted in the described connector along the direction of the described signal surface of described signal record medium.

2, a kind of device as claimed in claim 1, wherein, in the described optics box body optical system is housed, described optical system comprises and is used for deflection and comes from the catoptron and the optical detector that be used for Beam Transformation from described catoptron become electric signal of described object lens along the light beam of described signal surface direction; Described connector is positioned at the upper surface of the cover plate that is used to cover described optical system.

3, a kind of device as claimed in claim 1, wherein, described device further comprise be used for from optical detectors of beam direction of described object lens with the optical system that transforms the light beam into electronic information signal be used for focusing on light beam on the signal surface of signal record medium and make the object lens driving mechanism of the signal track that described light beam can the tracking signal recording medium; Described optical system and described driving mechanism are positioned at adjacent to each other along on the plane of described signal surface, and described connector is positioned at the upper surface of the cover plate that is used to cover described optical system.