JPH10177735A - Optical pickup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pickup easy to thin by removing the impedimental main cause of the thinning of the optical pickup. SOLUTION: This optical pickup is provided with a light source emitting light, a photodetector light receiving reflection light from an optical recording medium, a reflection means 2 reflecting the emitted light from the light source so as to become nearly vertical to the recording surface of the optical recording medium and an objective lens 3 focusing the emitted light through the reflection means 2 on the recording surface of the optical recording medium, and is constituted so as to make the light source and the photodetector come close to the optical recording medium than the reflection means 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup for recording and reproducing information on an optical disk, and more particularly, to recording and reproducing on an optical disk such as a compact disk (CD), a CD-ROM, and a digital video disk (DVD). Regarding possible optical pickups.

[0002]

2. Description of the Related Art In recent years, personal computers (hereinafter, referred to as personal computers)
The amount of data handled by a personal computer (PC) is steadily increasing, and a conventionally used storage device such as a floppy disk device cannot accommodate large-capacity computer software and programs. Instead of floppy disks, now 300-400 floppy disks
A CD-ROM drive using a compact disk having twice the storage capacity as a memory has come to be mounted on most desktop PCs. By the way, desktop type P
Along with C, notebook PCs have been increasingly used because of their space saving and portability. Due to the small volume of the notebook PC, the CD-ROM device to be mounted is required to be thin and small, and the optical pickup which is a key component of the CD-ROM device is also thin and small. Has been requested.

Hereinafter, a conventional optical pickup will be described. FIG. 4 is a sectional view of a conventional optical pickup.

An optical unit 201 has a stem 210 on which a semiconductor laser and a light receiving element (not shown) are mounted. 211 is the stem 210
The terminal 211 is electrically connected to a flexible printed board (not shown) or the like, and supplies power to the semiconductor laser, outputs a signal from the light receiving element, and the like. The stem 212 is covered with a cap 212 for accommodating a diffraction grating in addition to the semiconductor laser and the light receiving element described above. The cap 212 protects the semiconductor laser, the light receiving element, and the diffraction grating from outside. Further, a cover glass 213 is adhered to a hole provided on the cap. A hologram (not shown) is formed on the cover glass 213. The optical unit 201 alone can emit laser light and receive reflected light from an optical recording medium. The optical unit 201 is fixed to the carriage 206 so as to have an optical axis parallel to the recording surface of the optical recording medium 204.

Reference numeral 202 denotes a rising mirror, which emits light from the optical unit 201 to the recording surface 2 of the optical recording medium 204.
The light is reflected by the reflection surface 202r so as to be substantially perpendicular to the surface 04r. The rising mirror 202 is fixed to the bottom surface 205 of the carriage by inclining its reflection surface 202r by 45 ° with respect to the recording surface 204r of the optical recording medium 204. Reference numeral 203 denotes an objective lens which condenses outgoing light reflected from the rising mirror 202 with a minute spot on the recording surface of the optical recording medium 204.

The rising mirror 202 has a rectangular plate shape in cross section, and has an inclined reflecting surface 202r.
And a protrusion 202t protruding from the bottom of the carriage so as to face the bottom 205 of the carriage. The protrusion 202t and the bottom 205 of the carriage are fixedly arranged.

The operation of the optical pickup configured as described above will be described. Emitted light emitted from a semiconductor laser, which is a light source built in the optical unit 201, is divided into three beams by a diffraction grating (not shown), and also passes through a hologram (not shown) and rises up to a mirror 2
The light is reflected at 02 and becomes an optical axis substantially perpendicular to the recording surface 204r of the optical recording medium 204, and is converged by the objective lens 203 to form a spot on the recording surface 204r of the optical recording medium 204. The reflected light including the pit information of the recording surface 204r of the optical recording medium 204 passes through the objective lens 203 again, is reflected by the rising mirror 202, and is reflected by the recording surface 20r of the optical recording medium 204.
4r, and is diffracted by a hologram (not shown), received by a light receiving element (not shown) built in the optical unit 201, and is recorded on the recording surface 204 of the optical recording medium 204.
The pit information of r is reproduced. The focus detection is performed by the hologram Foucault method, and the track detection is performed by the three-beam method.

[0008]

However, in the conventional optical pickup, the stem 2 of the optical unit 201 is used.
10. Since the cap 212 is in contact with the bottom surface 205 of the carriage, the light beam cannot be arranged close to the bottom surface 205 of the carriage, and a surplus portion 220 is formed, so that the overall height of the carriage 206 must be set to be relatively large. Point, and furthermore, the outgoing light is transmitted to the recording surface 204 of the optical recording medium 204.
r, the angle between the reflecting surface 202r of the rising mirror 202 and the recording surface 204r of the optical recording medium 204 can be set to only 45 °, and the height of the rising mirror 202 itself is reduced. The two points that the optical pickup cannot be performed have been an obstacle to the reduction in thickness of the entire optical pickup.

An object of the present invention is to solve the above-mentioned conventional problems and to provide an optical pickup which can be easily made thin.

[0010]

According to the present invention, there is provided a light source for emitting light, a light receiving element for receiving light reflected from an optical recording medium, and a light receiving element for receiving light emitted from the light source. An optical pickup, comprising: a reflecting unit that reflects light so as to be substantially perpendicular to a recording surface of the optical recording medium; and an objective lens that focuses light emitted through the reflecting unit on a recording surface of the optical recording medium. The light source and the light receiving element are arranged closer to the optical recording medium than the reflection means.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claims 1 and 2 is directed to an optical unit integrally including a light source for emitting light and a light receiving element for receiving reflected light from an optical recording medium; An optical pickup comprising: a reflecting unit that reflects emitted light toward a recording surface of the optical recording medium, and an objective lens that focuses the emitted light that has passed through the reflecting unit onto a recording surface of the optical recording medium, Wherein the optical unit is closer to the optical recording medium than the reflecting means, and since the optical unit is closer to the optical recording medium than the reflecting means, the stem of the optical unit;
The light beam can be made to approach the bottom surface of the carriage without the cap or the like interfering with the bottom surface of the carriage, and the optical pickup can be made thin.

According to a third aspect of the present invention, there is provided an optical unit integrally including a light source for emitting light and a light receiving element for receiving light reflected from an optical recording medium; An optical pickup comprising: a reflecting unit that reflects light toward a recording surface of an optical recording medium; and an objective lens that focuses light emitted through the reflecting unit on a recording surface of the optical recording medium, wherein the optical unit includes: The optical unit is arranged so that the optical axis of the emitted light is inclined with respect to the recording surface of the optical recording medium, and the angle between the reflection surface of the reflection means and the recording surface of the optical recording medium is less than 45 °. Further, the angle A between the emitted light of the optical unit and the recording surface of the optical recording medium is set to 0 ° <A ≦ 6 °. , Optical unit By making the angle between the reflecting surface of the reflecting means and the recording surface of the optical recording medium less than 45 ° corresponding to the inclined arrangement, the height of the reflecting means occupying the carriage can be reduced, and the optical pickup can be used. The thickness can be reduced.

According to a fifth aspect of the present invention, in the optical unit, the optical axis of the outgoing light is closer to the optical recording medium than the center of the optical unit. The angle between the optical axis of the optical recording medium and the recording surface of the optical recording medium can be set large, and as a result, the angle between the reflecting surface of the reflection means and the recording surface of the optical recording medium can be set to be small. The size of the optical pickup can be further reduced.

According to a sixth aspect of the present invention, there is provided an optical unit in which a semiconductor laser for emitting laser light and a light receiving element for receiving reflected light from an optical recording medium are at least integrally formed, and an optical unit for emitting light from the optical unit. A plate-shaped rising mirror that reflects emitted light and guides it to the recording surface of the optical recording medium, an objective lens that focuses laser light passing through the rising mirror on the recording surface of the optical recording medium, the optical unit, and the optical unit; An optical pickup having a carriage that fixes a rising mirror and finely supports the objective lens, wherein a reflection surface of the rising mirror and a bottom surface of the carriage are arranged substantially continuously, and the optical unit is provided. Fixing the optical unit to the carriage so that the optical axis of the light emitted from the optical recording medium is inclined with respect to the recording surface of the optical recording medium; The angle between the recording surface of the body and the reflecting surface of the rising mirror is set to less than 45 °, so that the height of the rising mirror can be set lower, and the light is emitted to the optical recording medium. The optical path of light can be designed in a smaller space, and the optical pickup can be made thinner.

Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of an optical pickup according to Embodiment 1 of the present invention. Reference numeral 1 denotes an optical unit. The optical unit 1 has a stem 10 on which a semiconductor laser, which is a light source (not shown), and a light receiving element are mounted. Reference numeral 11 denotes a terminal that protrudes from the stem 10. The terminal 11 is electrically connected to a flexible printed circuit (not shown) or the like to supply power to the semiconductor laser, output a signal from the light receiving element, and the like. The stem 10 is covered with a cap 12 for accommodating a diffraction grating in addition to the semiconductor laser and the light receiving element described above.
The cap 12 protects the semiconductor laser, the light receiving element, and the diffraction grating from outside. Further, a cover glass 13 is adhered to a hole provided on the cap 12. A hologram (not shown) is formed on the cover glass 13.
The optical unit 1 alone can emit laser light and receive reflected light from an optical recording medium. The optical unit 1 is fixed to the carriage 5 so that the optical axis 14 of the light emitted from the optical unit 1 is inclined at a predetermined angle θ11 with respect to the recording surface 4 r of the optical recording medium 4. Thus, the optical unit 1 is fixed to the carriage 6 at a position closer to the optical recording medium 4 than the reflection unit 2. In this embodiment, the optical axis 14 of the light emitted from the optical unit 1 is set to the recording surface 4r of the optical recording medium 4.
Is fixed to the carriage 6 so as to be inclined at an angle of about 4 °. Thus, the optical unit 1 is moved to the carriage 6
To the stem 1 of the conventional optical unit 1.
0, the light beam could not be brought close to the bottom surface 5 of the carriage due to interference of the cap 12, etc.
Since the optical unit 1 is closer to the optical recording medium than the reflection means 2, the light beam can be arranged closer to the bottom surface 5 of the carriage. Thus, the surplus portion 20 of the carriage 6 can be made as thin as possible, and the carriage 6 can be made thinner, that is, the optical pickup can be made thinner.

The optical unit 1 does not necessarily have to be integrally formed, and the necessary optical elements as described above may be appropriately arranged along the optical path. The predetermined angle θ11 between the optical axis 14 of the light emitted from the optical unit 1 and the recording surface 4r of the optical recording medium 4 can be changed in accordance with design conditions. Is preferably in the range of approximately 0 ° <θ11 ≦ 6 °.

Reference numeral 2 denotes a reflecting means, for example, a rising mirror using a reflecting mirror having a reflectance increased to about 95% by depositing a silver thin film or a dielectric film on one surface of the plate-shaped optical glass is used. The reflection means 2 converts the light emitted from the optical unit 1 disposed at an angle to the recording surface 4r of the optical recording medium 4.
The light is reflected so as to be substantially vertical. Since the optical unit 1 is fixed to the carriage 6 at a predetermined angle θ11 as described above, the reflecting means 2 also needs to be arranged on the carriage 6 corresponding to the arrangement of the optical unit 1. Specifically, the reflecting means 2 is fixed to the bottom surface 5 of the carriage in a state where the angle θr1 between the recording surface 4r of the optical recording medium 4 and the reflecting surface 2r of the reflecting means 2 is less than 45 °.

In the present embodiment, θr1 is set to 43 ° corresponding to θ11 = 4 °.

The portion of the reflecting means 2 protruding from the state of the plate having a rectangular cross section and facing the bottom surface 5 of the carriage is removed by chamfering. Due to this chamfering, the reflecting means 2 has a slope 2t which is parallel to the bottom surface 5 of the carriage and forms almost one surface with the bottom surface 5 of the carriage when arranged. Since the reflecting means 2 has the slope 2t, the reflecting surface 2r of the reflecting means 2 is arranged substantially continuously with the bottom surface 5 of the carriage. Furthermore, the angle θr1 between the recording surface 4r of the optical recording medium 4 and the reflecting surface 2r of the reflecting means 2 corresponding to the inclined arrangement of the optical unit 1.
Is less than 45 °.

Since the reflecting means 2 is disposed on the bottom surface 5 of the carriage at an angle of less than 45 ° with respect to the recording surface 4r of the optical recording medium 4, the height of the reflecting means 2 can be set low. The optical path of the light emitted to the optical recording medium can be designed in a space-saving manner. That is, the optical pickup can be made thinner and smaller.

Reference numeral 3 denotes an objective lens which condenses outgoing light reflected from the reflecting means 2 with a minute spot on the recording surface 4r of the optical recording medium 4. As the objective lens 3, for example, an optical glass or a resin lens can be used. In order to reduce the inertia of the entire optical pickup, a lightweight resin objective lens is suitable. For example, an acrylic resin, a polyolefin resin, or the like is applied. Above all, when a polyolefin resin is used, the swelling factor can be reduced in the design items of the objective lens because the moisture resistance is superior to that of the acrylic resin, and the degree of freedom in designing the objective lens increases. Further, by utilizing this, if the configuration is such that the flange portion 3a of the objective lens 3 is smoothly connected to the lens peripheral portion as shown in FIG. 2, the conventional objective lens 203 and objective lens holding cylinder 207 shown in FIG. Since the height of the combination of the objective lens 3 and the objective lens holding cylinder 4 for holding the objective lens 3 can be made lower than the height of the combination of the above, this contributes to further thinning of the optical pickup.

Reference numeral 4 denotes an optical recording medium having a recording surface 4r. For example, an optical disk or the like having pit information in which a reflection film is provided with irregularities corresponding to the recording information is used as the recording surface.

Reference numeral 6 denotes a carriage.
Is an optical unit 1 and a reflecting means 2 fixed, and an objective lens 3
Are elastically supported via a suspension (not shown) and the objective lens holding cylinder 7 so as to be finely movable in the focus direction and the tracking direction. The carriage 6 is movable from one end to the other end of the optical recording medium 4 by integrally holding the optical unit 1, the reflecting means 2, and the objective lens 3 by moving means (not shown).

Numeral 7 denotes an objective lens holding cylinder, which adheres and fixes the objective lens 3 and drives the objective lens 3 in a focusing direction and a tracking direction with respect to the optical recording medium 4 via a suspension and an actuator (not shown).

The operation of the optical pickup configured as described above will be described. The emitted light emitted from a light source (not shown) in the optical unit 1 at a predetermined angle θl1 in a direction away from the recording surface 4r of the optical recording medium 4 is
The beam is divided into three beams by a diffraction grating (not shown), passes through a hologram (not shown), is reflected by the reflection means 2, becomes an optical axis substantially perpendicular to the recording surface 4 r of the optical recording medium 4, and is focused by the objective lens 3 for optical recording. Three spots are formed on the recording surface 4r of the medium 4. The reflected light from the recording surface 4r including the pit information of the recording surface 4r of the optical recording medium 4 passes through the objective lens 3 again, is reflected by the reflection means 2 and approaches the recording surface 4r of the optical recording medium 4. The optical axis is inclined by a predetermined angle θ11, is diffracted by a hologram (not shown) in the optical unit 1, is received by the light receiving element, and is
The pit information on the recording surface 4r is reproduced. Note that a known hologram Foucault method and three-beam method are used for focus detection and track detection.

(Embodiment 2) Hereinafter, Embodiment 2 of the present invention will be described with reference to the drawings. FIG. 3 is a sectional view of the optical pickup according to the second embodiment of the present invention. Components having the same reference numerals are the same as those in the first embodiment, and description thereof will be omitted.

An optical unit 101 has a stem 110 on which a semiconductor laser (not shown) and a light receiving element are mounted. 111 is stem 110
The terminal 111 is electrically connected to a flexible printed circuit board (not shown) or the like to supply power to the semiconductor laser, output a signal from the light receiving element, and the like. On the stem 110, a cap 112 for accommodating a diffraction grating in addition to the semiconductor laser and the light receiving element described above is covered. The cap 112 protects the semiconductor laser, the light receiving element, and the diffraction grating from outside. Further, a cover glass 113 is adhered to a hole provided on the cap 112. A hologram (not shown) is formed on the cover glass 113. The optical unit 101 can emit laser light and receive reflected light from an optical recording medium by itself.

The optical unit 101 is configured such that the optical axis 114 of the emitted light is shifted from the center 101a of the optical unit 101. Further, the outgoing light (optical axis 1 of
14) is a predetermined angle θ with respect to the recording surface 4r of the optical recording medium 4.
12 and the optical axis 11 of the optical unit 101
The optical unit 1 is moved to the carriage 5 so that the optical unit 4 is closer to the optical recording medium 4 than the center 101 a of the optical unit 101.
It is fixed to. Thus, the optical unit 101 is closer to the optical recording medium 4 than the reflection means 102, and the optical axis 114 of the optical unit 101 is further closer to the optical recording medium 4 than the center 101a of the optical unit 101.

Accordingly, the optical unit 101 can make the angle θ12 between the optical axis 114 of the emitted light and the recording surface 4r of the optical recording medium 4 larger than the angle θ11 in the first embodiment. Further, the optical axis 114 is the optical unit 101
, The optical unit 101 does not protrude from the upper surface of the carriage 6.

As the reflecting means 102, for example, a rising mirror using a reflecting mirror whose reflectance is increased to about 95% by depositing a silver thin film or a dielectric film on one surface of an optical glass plate is used. The reflecting means 102 reflects the light emitted from the optical unit 101 disposed obliquely so as to be substantially perpendicular to the recording surface 4r of the optical recording medium 4.

Since the optical unit 101 is fixed to the carriage 6 at a predetermined angle θ11 as described above, it is necessary that the reflecting means 102 be arranged on the carriage 6 in accordance with the arrangement of the optical unit 101. Specifically, the reflecting means 102 is fixed to the bottom surface 5 of the carriage in a state where the angle θr1 between the recording surface 4r of the optical recording medium 4 and the reflecting surface 102r of the reflecting means 102 is less than 45 °.

Here, in the reflecting means 102, a portion projecting opposite to the bottom surface 5 of the carriage is removed from the state of the plate having a rectangular cross section by chamfering. Due to this chamfering, the reflecting means 102 has an inclined portion 102t which is parallel to the bottom surface 5 of the carriage and is flush with the bottom surface 5 of the carriage when arranged. When the reflection means 102 is the slope portion 102t
The reflecting surface 102r of the reflecting means 102
Are arranged substantially continuously with the bottom surface 5 of the carriage. Further, the angle θr2 between the recording surface 4r of the optical recording medium 4 and the reflecting surface 2r of the reflecting means 2 is set to less than 45 ° in accordance with the inclined arrangement of the optical unit 101 at the predetermined angle θ12.

Further, the optical unit 101 and the reflecting means 1
02 will be described. As described above, the angle θ12 between the light beam and the recording surface 4r of the optical recording medium 4 in the optical unit 101 is larger than the angle θ11 in the first embodiment, as compared with the optical unit 1 in the first embodiment. Correspondingly, the reflection means 102 is also used for the optical recording medium 4.
Between the recording surface 4r of the optical recording medium 4 and the reflecting surface 2r of the reflecting means 2 in the first embodiment.
It is smaller than 1. That is, the reflecting means 102 has a larger reflecting surface 102 than the reflecting means 2 in the first embodiment.
r is lying on the carriage 6.
Thereby, the reflecting means 102 is moved to the recording surface 4 of the optical recording medium 4.
By arranging on the bottom surface 5 of the carriage at an angle of θr2 with respect to r, the height of the reflecting means 102 can be set even lower, so that the optical path of the light emitted to the optical recording medium can be designed with further space saving. . That is, it is possible to further reduce the thickness and size of the optical pickup.

Steps 3 to 7 are the same as those described in the first embodiment, and a description thereof will be omitted. The operation of the optical pickup configured as described above will be described. Light emitted from a light source (not shown) in the optical unit 101 at a predetermined angle θ12 in a direction away from the recording surface 4r of the optical recording medium 4 is split into three beams by a diffraction grating (not shown), and is not shown. The light passes through the hologram and is reflected by the reflection means 102 to become an optical axis substantially perpendicular to the recording surface 4r of the optical recording medium 4, and is converged by the objective lens 3 to form three spots on the recording surface 4r of the optical recording medium 4. . The reflected light from the recording surface 4r including the pit information of the recording surface 4r of the optical recording medium 4 passes through the objective lens 3 again, is reflected by the reflection means 2 and approaches the recording surface 4r of the optical recording medium 4. The optical axis is inclined by a predetermined angle θ12, is diffracted by a hologram (not shown) in the optical unit 1, is received by the light receiving element, and the pit information on the recording surface 4r of the optical recording medium 4 is reproduced. Note that the well-known hologram Foucault method and three-beam method are used for focus detection and track detection as in the first embodiment.

[0035]

According to the present invention, since the optical unit is arranged closer to the optical recording medium than the reflection means, the thickness of the optical pickup can be reduced.

Further, the optical axis of the light emitted from the light source is inclined with respect to the recording surface of the optical recording medium, and the reflecting means is arranged on the carriage at an angle of less than 45 °, thereby further reducing the thickness of the optical pickup. Becomes possible.

By arranging the reflecting surface of the reflecting means and the bottom surface of the carriage substantially continuously, the height of the reflecting means can be further reduced, and the optical pickup can be made thinner.

[Brief description of the drawings]

FIG. 1 is a sectional view of an optical pickup according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an objective lens used in the optical pickup according to one embodiment of the present invention;

FIG. 3 is a cross-sectional view of an optical pickup according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional optical pickup.

FIG. 5 is a sectional view of an objective lens used in a conventional optical pickup.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical unit 2 Reflecting means 2r Reflecting surface 2t Slope 3 Objective lens 3a Collar 4 Optical recording medium 4r Recording surface 5 Carriage bottom surface 6 Carriage 7 Objective lens holding tube 10 Stem 11 Terminal 12 Cap 13 Cover glass 14 Optical axis 101 Optical Unit 101a Center of optical unit 102 Reflecting means 102r Reflecting surface 102t Slope 110 Stem 111 Terminal 112 Cap 113 Cover glass 114 Optical axis 201 Optical unit 202 Start-up mirror 202r Reflecting surface 202t Projecting portion 203 Objective lens 204 Optical recording medium 204r Recording surface 205 Bottom of carriage 206 Carriage 207 Object lens holding cylinder

Claims (6)

[Claims] A light source that emits light, a light receiving element that receives light reflected from an optical recording medium, and a reflection unit that reflects light emitted from the light source toward a recording surface of the optical recording medium; An optical pickup comprising: an objective lens that focuses outgoing light that has passed through the reflection unit on a recording surface of the optical recording medium, wherein the light source and the light receiving element are closer to the optical recording medium than the reflection unit. An optical pickup that features. An optical unit integrally including a light source for emitting light and a light receiving element for receiving reflected light from an optical recording medium;
An optical pickup comprising: a reflection unit that reflects light emitted from the optical unit toward a recording surface of the optical recording medium; and an objective lens that focuses the light emitted through the reflection unit on a recording surface of the optical recording medium. An optical pickup, wherein the optical unit is closer to the optical recording medium than the reflecting means. An optical unit integrally including a light source for emitting light and a light receiving element for receiving reflected light from an optical recording medium;
An optical pickup comprising: a reflection unit that reflects light emitted from the optical unit toward a recording surface of the optical recording medium; and an objective lens that focuses the light emitted through the reflection unit on a recording surface of the optical recording medium. And arranging the optical unit so that an optical axis of light emitted from the optical unit is inclined with respect to a recording surface of the optical recording medium; and a reflection surface of the reflection unit and a recording surface of the optical recording medium. An optical pickup characterized in that the angle formed by the angle is less than 45 °. 4. The optical pickup according to claim 3, wherein an angle A between the light emitted from the optical unit and a recording surface of the optical recording medium is 0 ° <A ≦ 6 °. 5. The optical pickup according to claim 3, wherein the optical unit has an optical axis of emitted light closer to an optical recording medium than a center of the optical unit. 6. An optical unit in which a semiconductor laser that emits laser light and a light receiving element that receives reflected light from an optical recording medium are at least integrated with each other; A plate-shaped rising mirror that guides to the recording surface of the recording medium, an objective lens that focuses the laser beam passing through the rising mirror on the recording surface of the optical recording medium, and fixing the optical unit and the rising mirror, An optical pickup having a carriage that finely supports the objective lens, wherein a reflection surface of the rising mirror and a bottom surface of the carriage are arranged substantially continuously, and an optical axis of light emitted from the optical unit is adjusted. Fixing the optical unit to the carriage so as to be inclined with respect to the recording surface of the optical recording medium; An optical pickup, characterized in that the angle between the reflecting surface of the lower mirror was less than 45 °.