JP2007157223A - Optical pickup device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correctly detect the light quantity of the output of the light source of a laser beam. <P>SOLUTION: The tilt angle of the side face 33 of a first prism 23 constituting an optical separation component 25 is changed to previously set the length of a projecting surface 32 so that a length obtained by subtracting a predicted maximum value of the length of an adhesive protruded when sticking a first prism 3 and a second prism 4 with the adhesive may be sufficiently longer than a length with which the light quantity of a second laser beam totally reflected by a projecting surface 32 and incident on an optical monitor 26 becomes a desired light quantity. Thus, diffraction light of the second laser beam from a hologram pattern 29 is entirely made incident on only an area in which a projecting adhesive at the projecting surface 32 does not exist to prevent degrading of the S/N ratio of a signal output from the optical monitor 26 to correctly detect the light quantity of the output of a second light source 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical pickup device capable of reproducing, recording or erasing information recording media.

  As an optical pickup device that records and reproduces an optical disk, there is one corresponding to two kinds of optical disks. This type of optical pickup apparatus needs to use laser beams having different wavelengths depending on the type of optical disk. For example, when both recording and reproduction are performed on a CD and a DVD, a first laser device that emits laser light for writing and reading information on the CD, and writing information on the DVD And a second laser device that emits a laser beam for reading.

  Conventionally, there is an optical pickup device of this type having an optical output system as shown in FIG. 5 (Japanese Patent Laid-Open No. 2004-103176 (Patent Document 1)). In this optical pickup device, a first light source 1 that emits a first laser beam with a wavelength λ1 for data reproduction, and a second light source 2 that emits a second laser beam with a wavelength λ2 for data reproduction and data recording, The optical separation element 5 includes a first prism 3 and a second prism 4, an optical monitor 6 for a second laser beam, and an objective lens 7.

  The first prism 3 and the second prism 4 constituting the light separating element 5 are bonded together with an adhesive, and a wavelength selection film is provided between the bonded surfaces of the first prism 3 and the second prism 4. 8 is interposed. The wavelength selection film 8 reflects the first laser light having the wavelength λ 1 emitted from the first light source 1 toward the objective lens 7 and transmits the second laser light having the wavelength λ 2 emitted from the second light source 2. And is made incident on the objective lens 7. A hologram element 10 having a hologram pattern 9 is disposed between the second light source 2 and the light separation element 5.

  The pickup device having the above configuration operates as follows. That is, the first laser beam for data reproduction emitted from the first light source 1 is reflected toward the objective lens 7 by the wavelength selection film 8 and is condensed on the surface of the disk 11 such as a CD by the objective lens 7. The On the other hand, the second laser beam for data reproduction and data recording emitted from the second light source 2 is incident on the hologram pattern 9 of the hologram element 10. Then, the 0th-order light of the second laser light that is not diffracted by the hologram pattern 9 enters the light separating element 5 after passing through the hologram pattern 9. Then, the light passes through the wavelength selection film 8 and enters the objective lens 7, and is focused on the surface of the disk 11 such as a DVD by the objective lens 7.

  Of the second laser light emitted from the second light source 2, the diffracted light diffracted by the hologram pattern 9 of the hologram element 10 enters the light separating element 5. Here, of the first prism 3 and the second prism 4 constituting the light separating element 5, the surface of the second prism 4 on which the second laser light is incident is bonded to the first prism 3. The prism 3 is longer in length than the bonding surface with the second prism 4, and the bonding surface of the second prism 4 protrudes outward from the first prism 3. Therefore, the wavelength selection film 8 is not formed on the projecting surface 12 of the second prism 4 projecting from the first prism 3. The diffracted light diffracted by the hologram pattern 9 enters the second prism 4 and reaches the protruding surface 12. At that time, the incident angle to the protruding surface 12 is larger than the critical angle. Therefore, the diffracted light diffracted by the hologram pattern 9 is totally reflected by the protruding surface 12 and enters the optical monitor 6.

  However, the conventional optical pickup device disclosed in Patent Document 1 has the following problems. In other words, the bonding surface of the second prism 4 with the first prism 3 is longer than the bonding surface of the first prism 3 with the second prism 4. Therefore, when the first prism 3 and the second prism 4 are bonded with an adhesive, the adhesive 13 protrudes from the protruding surface 12.

  Therefore, the critical angle for the total reflection of the incident second laser light at the portion of the protruding surface 12 of the second prism 4 covered with the protruding adhesive 13 is the case where the adhesive 13 is not present. And a different angle. For this reason, total reflection does not occur where the adhesive 13 is present on the projecting surface 12, and the amount of the second laser light incident on the optical monitor 6 may be reduced. In that case, the S / N ratio of the signal output from the optical monitor 6 is lowered, and there arises a problem that the output output of the second laser beam cannot be accurately detected.

Furthermore, in order to avoid a decrease in the amount of incident light on the optical monitor 6 due to the protruding adhesive 13, a step of wiping the protruding adhesive 13 with a brush or the like is necessary, which causes a problem that the production efficiency is lowered.
JP 2004-103176 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide an optical pickup device with high production efficiency capable of accurately detecting the output light amount of a laser light source.

In order to solve the above problems, an optical pickup device of the present invention is
A first light source that emits a first laser beam;
A second light source that emits a second laser beam having a wavelength different from that of the first laser beam;
An objective lens that focuses the first laser light and the second laser light on a data recording surface of an optical disc;
An optical monitor for detecting the amount of the second laser beam;
A wavelength selection film that reflects the first laser light emitted from the first light source toward the objective lens, and transmits the second laser light emitted from the second light source to enter the objective lens. And a light separation element having a light reflecting portion for reflecting the second laser light emitted from the second light source toward the optical monitor,
The light separating element receives at least part of one side surface of the first prism on which the first laser light emitted from the first light source is incident and the second laser light emitted from the second light source. And at least a part of one side surface of the second prism to be bonded with an adhesive,
The wavelength selection film is sandwiched between at least a part of one side surface of the bonded first prism and at least a part of one side surface of the second prism,
The light reflecting portion is provided on the second prism,
When the first prism and the second prism are bonded to at least one of the first prism and the second prism with an adhesive, the adhesive protrudes from an adhesive surface, and the light reflecting portion An overhang area that is an area that does not overlap the area is provided.

  According to the above configuration, the “extrusion region” where the adhesive protrudes when the first prism and the second prism are bonded together with the adhesive is provided in at least one of the first prism and the second prism. The second laser light from the light source is provided in advance so as not to overlap with the region of the light reflecting portion that reflects the second laser light toward the optical monitor. Therefore, if the region of the light reflecting portion is formed in advance in an area where the second laser beam having a desired light amount can be reflected toward the optical monitor, the first prism and the second prism are bonded together. In this case, even if the adhesive protrudes from the “extrusion area”, the amount of the second laser light reflected by the light reflecting portion and incident on the optical monitor is changed to S of the signal output from the optical monitor. It is possible to maintain the desired light amount that can prevent a decrease in the / N ratio.

  That is, according to the present invention, it is possible to accurately detect the amount of light output from the second light source. Further, when the light separating element is formed by bonding the first prism and the second prism with an adhesive, it is not necessary to wipe off the protruding adhesive with a brush or the like, and the production efficiency of the optical pickup device is increased. Can do it.

In the optical pickup device of one embodiment,
An end of the second prism on one side of the optical monitor protrudes from one side of the first prism,
The light reflecting portion and the protruding region are provided on a protruding surface protruding from one side surface of the first prism on one side surface of the second prism,
The protruding region is disposed on the first prism side with respect to the light reflecting portion and adjacent to the first prism.

  According to this embodiment, the light reflecting portion and the protruding region are provided on the projecting surface of the second prism. Therefore, with respect to the optical pickup device that does not have the protruding region, the inclination angle of the side surface adjacent to the one side surface of the first prism and facing the protruding surface is changed, or the side surface of the first prism is changed. The protruding region can be easily formed by moving the position of the second prism to the side of the light monitor or extending the protruding surface of the second prism to the side of the light monitor.

In the optical pickup device of one embodiment,
An end of the second prism on one side of the optical monitor protrudes from one side of the first prism,
The light reflecting portion is provided on a protruding surface protruding from one side surface of the first prism on one side surface of the second prism,
The protruding region is formed over the entire width of the first prism at a convex portion formed by intersecting the one side surface of the first prism and the side surface facing the regular surface and facing the protruding surface. It is a notch and is an adhesive reservoir that accommodates the adhesive protruding from the adhesive surface.

  According to this embodiment, the side of the first prism facing the protruding surface is provided with an adhesive reservoir made of a notch for accommodating the adhesive protruding from the adhesive surface as the protruding region. Therefore, when the first prism and the second prism are bonded together, the protruding adhesive is completely accommodated in the adhesive reservoir and is prevented from protruding into the light reflecting portion.

In the optical pickup device of one embodiment,
The shape of the cross section perpendicular to the one side surface and the side surface of the first prism in the adhesive reservoir is a triangle having apexes on the one side surface and the side surface of the first prism.

  According to this embodiment, the cross-sectional shape of the adhesive reservoir is a triangle. Therefore, the adhesive reservoir can be easily formed by simply cutting the convex portion formed by intersecting the one side surface and the side surface of the first prism obliquely from the side surface toward the one side surface over the entire width. can do.

In the optical pickup device of one embodiment,
The shape of the cross section perpendicular to the one side surface and the side surface of the first prism in the adhesive reservoir is substantially rectangular.

  According to this embodiment, the adhesive reservoir has a substantially square cross-sectional shape. Therefore, when the depth along the protruding surface 41 of the adhesive reservoir is the same as the depth of the adhesive reservoir having a triangular cross-sectional shape, more protrusions than the adhesive reservoir having a triangular cross-sectional shape. An adhesive can be accommodated. In other words, if the same amount of protruding adhesive is accommodated, the depth of the adhesive reservoir along the protruding surface can be made shallower than the adhesive reservoir having a triangular cross-sectional shape.

In the optical pickup device of one embodiment,
The cross-sectional shapes of the first prism and the second prism constituting the light separating element are such that the first laser light and the second laser light are not kicked.

  According to this embodiment, the cross-sectional shapes of the first prism and the second prism are made such that the first laser beam and the second laser beam are not kicked. Therefore, if the area of the cross-sectional shape is made as small as possible, the weight of each prism can be reduced, and further the weight of the optical pickup device can be reduced.

  As is clear from the above, when the optical pickup device of the present invention forms the light separation element by bonding the prisms to at least one of the first prism and the second prism with an adhesive, Since the “extrusion area” that protrudes is provided so as not to overlap with the area of the light reflection section that reflects the second laser light from the second light source toward the optical monitor, the area of the light reflection section is set to a desired value. If an amount of the second laser light is formed in an area that can be reflected toward the optical monitor in advance, even if the adhesive protrudes from the protruding area when the two prisms are bonded to each other, they are incident on the optical monitor. The amount of the second laser light can be kept at the desired amount of light that can prevent a decrease in the S / N ratio of the signal output from the optical monitor.

  Therefore, it is possible to accurately detect the amount of light output from the second light source. Further, when the light separating element is formed by bonding the both prisms with an adhesive, it is not necessary to wipe off the protruding adhesive with a brush or the like, and the production efficiency of the optical pickup device can be increased.

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

First Embodiment FIG. 1 is a cross-sectional view of an optical pickup device according to this embodiment. FIG. 2 is an enlarged view of a portion B in FIG.

  In FIG. 1, a first light source 21, a second light source 22, a second prism 24, an optical monitor 26, an objective lens 27, a wavelength selection film 28, a hologram pattern 29, a hologram element 30 and a disk 31 are shown in FIG. Since it is the same as the first light source 1, the second light source 2, the second prism 4, the optical monitor 6, the objective lens 7, the wavelength selection film 8, the hologram pattern 9, the hologram element 10 and the disk 11 in the optical pickup device, the description Omitted.

  In the present embodiment, as shown in FIG. 2, the second prism 24 is bonded to the first prism 23 with an adhesive to constitute a light separating element 25. Then, the bonding surface of the second prism 24 on which the second laser light is incident with the first prism 23 is longer than the bonding surface of the first prism 23 with the second prism 24, The bonding surface of the two prisms 24 protrudes outward from the first prism 23 to form a protruding surface 32. Note that the wavelength selection film 28 is not formed on the protruding surface 32.

Further, in the first prism 23, the inclination angle θ with respect to the projecting surface 32 at the side surface 33 adjacent to the bonding surface with the second prism 24 and facing the projecting surface 32 of the second prism 24 is shown in FIG. By setting the inclination angle θ _{0 of the} side surface facing the projecting surface 12 of the first prism 3 in the optical pickup device to be smaller than the length L of the projecting surface 32 along the paper surface in FIG. Thus, the amount of the second laser light incident on the optical monitor 26 is longer than the length L ₀ at which the desired amount of light is obtained.

Further, the length L of the protruding surface 32, by subtracting the first prism 23 the predicted maximum value L ₁ length of along the plane of the adhesive 34 protrude when the second prism 24 bonding with adhesive The length L ₂ is set in advance so as to be sufficiently longer than the length L ₀ . The holographic pattern 29 of the holographic element 30 is similar to the holographic pattern 9 shown in FIG. 5 in that the diffracted light diffracted by the holographic pattern 29 enters the region of the length L ₀ from the end of the protruding surface 32. It is formed so as not to be incident on the region of length L ₁ where the protruding adhesive 34 exists.

Therefore, all the diffracted light of the second laser light diffracted by the hologram pattern 29 of the hologram element 30 is incident only on the region where the protruding adhesive 34 of length L ₀ does not exist from the end of the protruding surface 32. The light is totally reflected toward the optical monitor 26. In this case, the length L _{0 of the} region where the second laser light is incident on the protruding surface 32 is set to a length that allows a desired light amount to be obtained. Therefore, the light amount of the second laser light that is totally reflected by the protruding surface 32 and enters the optical monitor 26 can be kept at a light amount that can prevent the S / N ratio of the signal output from the optical monitor 26 from being lowered. It is.

  That is, according to the present embodiment, it is possible to accurately detect the output light amount of the second light source 22 while preventing the S / N ratio of the signal output from the optical monitor 26 from being lowered. Furthermore, when the light separating element 25 is formed by bonding the first prism 23 and the second prism 24 with an adhesive, it is not necessary to wipe off the protruding adhesive 34 with a brush or the like, which increases the production efficiency of the optical pickup device. It can be increased.

As described above, in the present embodiment, the “protrusion region (region of length L ₁ )” that the adhesive 34 protrudes when the first prism 23 is bonded to the protruding surface 32 of the second prism 24. And an area where the diffracted light from the hologram pattern 29 can enter without the adhesive 34 protruding (area of length L ₂ ). The length L _{2 of the} region where the diffracted light can be incident is set to be longer than the length L ₀ of the “light reflecting portion” capable of totally reflecting the second laser beam having a desired light amount, and the hologram pattern 29 is It is set so that the diffracted light from the hologram pattern 29 protrudes and enters the light reflecting portion having the length L ₀ where the adhesive 34 does not exist. By doing so, the light amount of the second laser light that is totally reflected by the projecting surface 32 and incident on the optical monitor 26 is changed to a desired light amount that can prevent a decrease in the S / N ratio of the signal output from the optical monitor 26. You can keep it.

In the present embodiment, the inclination angle θ on the side surface 33 of the first prism 23 is an acute angle, but it may be an obtuse angle. However, in this case, it goes without saying that the length L of the protruding surface 32 is increased by making the inclination angle θ larger than the original inclination angle θ ₀ .

  Further, in the present embodiment, the inclination angle θ at the side surface 33 of the first prism 23 is changed with respect to the optical pickup device that does not have the “protruding region” as in the optical pickup device shown in FIG. By doing so, the length L of the protruding surface 32 is increased. However, the present invention is not limited to this, and the length L of the protruding surface 32 can be increased by translating the position of the side surface 33 toward the first light source 21. Alternatively, the length L of the protruding surface 32 can be increased by extending the bonding surface of the second prism 24 to the first prism 23 toward the optical monitor 26 side. However, in that case, it is necessary to change the hologram pattern 29 so that the diffraction angle is outside the case of FIG.

Second Embodiment FIG. 3 is a cross-sectional view of the optical pickup device according to the present embodiment.

  In FIG. 3, the first light source 21, the second light source 22, the second prism 24, the optical monitor 26, the objective lens 27, the wavelength selection film 28, the hologram pattern 29, the hologram element 30 and the disk 31 are the same as those shown in FIG. Since it is the same as the case of 1 embodiment, the same number is attached | subjected and description is abbreviate | omitted. The protruding surface 41 is the same as the protruding surface 12 in the conventional optical pickup device shown in FIG.

  In the present embodiment, in the first prism 42 which is bonded to the second prism 24 with an adhesive to constitute the light separating element 43, the bonding surface with the second prism 24 and the bonding surface are adjacent to each other. In addition, a convex portion formed by intersecting the side surface 44 facing the projecting surface 41 of the second prism 24 is a notch having a substantially square cross-sectional shape along the paper surface in FIG. 3 over the entire width of the first prism 42. An adhesive reservoir 45 is formed. In this case, the projecting surface 41 of the second prism 24 is outside the adhesive reservoir 45 of the first prism 42, and the length of the projecting surface 41 along the paper surface in FIG. 3 is the conventional light shown in FIG. The length is the same as the length of the protruding surface 12 when there is no protruding adhesive 13 in the pickup device (that is, the length at which the light amount of the second laser light that is totally reflected by the protruding surface 41 and enters the optical monitor 26 becomes the desired light amount). )It has become.

  Therefore, by setting the volume of the adhesive reservoir 45 to a volume that can completely accommodate the protruding adhesive (not shown) when the first prism 42 and the second prism 24 are bonded together with an adhesive. The protruding adhesive is accumulated in the adhesive reservoir 45 of the first prism 42. By doing so, it is possible to prevent the adhesive from protruding to the region of the projecting surface 41 when the first prism 42 and the second prism 24 are bonded together with the adhesive.

  That is, according to the present embodiment, when the light separating element 43 is formed by bonding the first prism 42 and the second prism 24 with an adhesive, the protruding adhesive is completely contained in the adhesive reservoir 45. Can be accommodated. Therefore, the length along the paper surface of FIG. 3 of the region where the protruding adhesive 41 does not exist is the same as the length of the protruding surface 12 when the protruding adhesive 13 does not exist in the conventional optical pickup device shown in FIG. Accordingly, it is possible to prevent a decrease in the amount of the second laser light incident on the optical monitor 26 due to the protruding adhesive.

  Moreover, according to this Embodiment, the process which wipes off the said protrusion adhesive agent with a brush etc. becomes unnecessary, and can improve production efficiency.

  FIG. 4 is a cross-sectional view showing an example different from FIG. 3 in the optical pickup device of the present embodiment.

  4, the first light source 21, the second light source 22, the second prism 24, the optical monitor 26, the objective lens 27, the wavelength selection film 28, the hologram pattern 29, the hologram element 30, the disk 31 and the protruding surface 41 are shown in FIG. Since the optical pickup apparatus is the same as that shown in FIG.

  In the present embodiment, in the first prism 51 that is bonded to the second prism 24 with an adhesive to form the light separation element 52, the bonding surface with the second prism 24 and the bonding surface are adjacent to each other. 4 at the position of the bonding surface with the second prism 24 over the entire width of the first prism 51 on the convex portion formed by intersecting the side surface 53 facing the protruding surface 41 of the second prism 24. It has a cross-sectional shape that is deepest along the plane of the paper and linearly shallows toward the objective lens 27 (in short, a triangular shape having apexes on the bonding surface and the side surface 53). An adhesive reservoir 54 formed by notches is formed. In this case, the projecting surface 41 of the second prism 24 is outside the adhesive reservoir 54 of the first prism 51, and the length of the projecting surface 41 along the plane of FIG. 4 is the conventional optical pickup shown in FIG. The length of the protruding surface 12 in the case where the protruding adhesive 13 is not present in the apparatus is the same as the length of the second laser light that is totally reflected by the protruding surface 41 and incident on the optical monitor 26 (that is, a desired light amount). It has become.

  Therefore, by setting the volume of the adhesive reservoir 54 to a volume that can completely accommodate the protruding adhesive (not shown) when the first prism 51 and the second prism 24 are bonded together with an adhesive. The protruding adhesive is accumulated in the adhesive reservoir 54 of the first prism 51. That is, when the first prism 51 and the second prism 24 are bonded together with an adhesive, the adhesive is prevented from protruding to the region of the protruding surface 41 and is incident on the optical monitor 26 caused by the protruding adhesive. It is possible to prevent a decrease in the amount of the second laser light.

  In the case of the embodiment shown in FIG. 4, the side surface 53 of the first prism 51 is obliquely cut in order to form the adhesive reservoir 54 in the first prism 51. As described above, since the adhesive reservoir 54 can be formed simply by cutting the side surface 53 of the first prism 51, a notch having a substantially square cross-sectional shape is formed on the side surface 44 as in the optical pickup device shown in FIG. The adhesive reservoir 54 can be easily formed as compared with the case where it is formed by cutting or the like.

  Here, when the notch having a substantially square cross-sectional shape is formed on the side surface 44 as in the optical pickup device shown in FIG. 3, the formation of the adhesive reservoir 45 is troublesome as described above. However, in the comparison with the optical pickup device shown in FIG. 4, when the depths of the adhesive reservoirs 45 and 54 along the protruding surface 41 of the second prism 24 are the same, the adhesive reservoir 45 is more adhesive. More protruding adhesive than the reservoir 54 can be accommodated. In other words, if the same amount of protruding adhesive is accommodated, the depth along the protruding surface 41 can be reduced.

  In addition, the cross-sectional shape including the optical axes of the first and second laser beams of the prisms 23, 24, 42, and 51 in each of the above embodiments is limited to the shapes shown in FIGS. is not. In short, any cross-sectional shape that does not cause the first and second laser beams to be kicked can be used. Furthermore, if the area of the cross-sectional shape is made as small as possible within the range in which the first and second laser beams are not kicked, the prisms 23, 24, 42, and 51 can be reduced in weight, and the optical pickup device can be reduced in weight. Can be achieved.

  In each of the above embodiments, the region where the adhesive 34 protrudes and the adhesive reservoirs 45 and 54 are formed by deforming the first prisms 23, 42 and 51. However, the present invention is not limited to this, and the adhesive protrudes depending on the balance between the portion of the light reflecting portion constituted by the protruding surfaces 32 and 41 and the portion wetted by the protruding adhesive. The region or the adhesive reservoir may be formed by deforming the second prism 24.

It is sectional drawing in the optical pick-up apparatus of this invention. It is an enlarged view of the B section in FIG. It is sectional drawing of the optical pick-up apparatus different from FIG. It is sectional drawing of the optical pick-up apparatus different from FIG. 1 and FIG. It is sectional drawing of the conventional optical pick-up apparatus.

Explanation of symbols

21 ... 1st light source,
22 ... second light source,
23, 42, 51 ... first prism,
24 ... second prism,
25, 43, 52 ... light separating element,
26: Optical monitor,
27 ... Objective lens,
28 ... wavelength selective film,
29 ... Hologram pattern,
30 ... Hologram element,
31 ... disc,
32, 41 ... protruding surface,
33,44,53 ... side,
34 ... Adhesive,
45, 54 ... Adhesive reservoir.

Claims (6)

A first light source that emits a first laser beam;
A second light source that emits a second laser beam having a wavelength different from that of the first laser beam;
An objective lens that focuses the first laser light and the second laser light on a data recording surface of an optical disc;
An optical monitor for detecting the amount of the second laser beam;
A wavelength selection film that reflects the first laser light emitted from the first light source toward the objective lens, and transmits the second laser light emitted from the second light source to enter the objective lens. And a light separation element having a light reflecting portion for reflecting the second laser light emitted from the second light source toward the optical monitor,
The light separating element receives at least part of one side surface of the first prism on which the first laser light emitted from the first light source is incident and the second laser light emitted from the second light source. And at least a part of one side surface of the second prism to be bonded with an adhesive,
The wavelength selection film is sandwiched between at least a part of one side surface of the bonded first prism and at least a part of one side surface of the second prism,
The light reflecting portion is provided on the second prism,
When the first prism and the second prism are bonded to at least one of the first prism and the second prism with an adhesive, the adhesive protrudes from an adhesive surface, and the light reflecting portion An optical pick-up apparatus, characterized in that an overhang area that is an area that does not overlap with the area is provided. The optical pickup device according to claim 1,
An end of the second prism on one side of the optical monitor protrudes from one side of the first prism,
The light reflecting portion and the protruding region are provided on a protruding surface protruding from one side surface of the first prism on one side surface of the second prism,
The optical pickup device, wherein the protruding region is disposed on the first prism side with respect to the light reflecting portion and adjacent to the first prism. The optical pickup device according to claim 1,
An end of the second prism on one side of the optical monitor protrudes from one side of the first prism,
The light reflecting portion is provided on a protruding surface protruding from one side surface of the first prism on one side surface of the second prism,
The protruding region is formed over the entire width of the first prism at a convex portion formed by intersecting the one side surface of the first prism and the side surface facing the regular surface and facing the protruding surface. An optical pickup device, which is a notch and is an adhesive reservoir that accommodates an adhesive protruding from an adhesive surface. The optical pickup device according to claim 3,
The cross section perpendicular to the one side surface and the side surface of the first prism in the adhesive reservoir is a triangle having apexes on the one side surface and the side surface of the first prism. Pickup device. The optical pickup device according to claim 3,
The optical pickup device according to claim 1, wherein a shape of a cross section perpendicular to the one side surface and the side surface of the first prism in the adhesive reservoir is substantially rectangular. The optical pickup device according to claim 1,
The optical pickup device according to claim 1, wherein the first prism and the second prism constituting the light separation element have cross-sectional shapes that do not kick the first laser beam and the second laser beam.

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