JP7203993B2 - Protective tape, optical module with protective tape, method for protecting optical module, and method for manufacturing optical device - Google Patents

Description

The present invention relates to a protective tape for protecting an optical module, an optical module with a protective tape using the same, a method for protecting an optical module, and a method for manufacturing an optical device.

An optical module in which a module substrate on which a light emitting element or a light receiving element is mounted is sealed with a transparent resin has a light transmitting portion through which light emitted from the light emitting element or incident on the light receiving element is transmitted. If the light transmitting portion is contaminated, the light emitted from the light emitting element or the light incident on the light receiving element is attenuated, or unintended refraction or reflection occurs. For this reason, a method has been adopted in which a protective tape is attached to the light transmitting portion of the optical module before it is mounted on the circuit board to prevent the light transmitting portion from being damaged. That is, the optical module with the protective tape is mounted on the circuit board, and the protective tape is peeled off from the optical module after mounting on the circuit board, thereby preventing the light-transmitting part from being damaged during mounting on the circuit board.

When the adhesive of the protective tape comes into contact with the light-transmitting portion when protecting the light-transmitting portion of the optical module with the protective tape, the adhesive may remain on the light-transmitting portion.

Patent Literature 1 discloses a camera module in which a lens protruding from the surface of the lens barrel is protected by attaching a protective tape, in which another adhesive tape is laminated only on the outer periphery of the adhesive tape, to the lens barrel. there is In the invention disclosed in Patent Document 1, since the central portion of the adhesive tape does not come into contact with the lens, the adhesive of the adhesive tape is prevented from adhering to the lens, while floating foreign substances in the air are prevented from adhering to the lens. and prevent scratches on the lens.

WO2016/181741

However, in the invention disclosed in Patent Document 1, the area covered with the protective tape becomes a closed space. As a result, the gas generated in the closed space adheres to the lens, and the internal pressure in the area covered with the protective tape increases, causing the protective tape to peel off.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a protective tape capable of protecting a light transmitting portion when attached to an optical module without making the portion covering the light transmitting portion a closed space. do.

In order to solve the above-described problems and achieve the object, the present invention provides a protective tape that is attached to the optical surface of an optical module to prevent foreign matter from adhering to the light transmitting portion of the optical surface, It has an adhesive tape having an adhesive layer on one surface, and a spacer attached to the adhesive layer in a portion outside the first region corresponding to the light transmitting portion. The adhesive tape has a second area where no spacer is attached and extends from the first area to the outer edge of the adhesive tape.

ADVANTAGE OF THE INVENTION According to this invention, it is effective in the ability to obtain the protective tape which can protect a light transmission part, without making the part which covers a light transmission part into an airtight space, when it sticks to an optical module.

1 is an exploded perspective view showing a configuration of an optical module with a protective tape according to Embodiment 1; FIG. 1 is a plan view of an optical module with protective tape according to Embodiment 1. FIG. Cross-sectional view of the optical module according to the first embodiment Sectional view of optical module with protective tape according to Embodiment 1 Sectional view of optical module with protective tape according to Embodiment 1 FIG. 4 is a diagram showing a manufacturing procedure of an encoder using the optical module with protective tape according to the first embodiment; FIG. 4 is a diagram showing a manufacturing procedure of an encoder using the optical module with protective tape according to the first embodiment; Plan view of masking tape according to Embodiment 2 Plan view of masking tape according to first modification of embodiment 2 Plan view of masking tape according to second modification of embodiment 2 Plan view of masking tape according to third modification of embodiment 2 Plan view of optical module with protective tape according to Embodiment 3 Cross-sectional view of optical module with protective tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 A diagram showing a procedure for creating a masking tape according to Embodiment 3 FIG. 11 is a diagram showing a method of leaving a tape or film cut out when producing a protective tape according to Embodiment 3 on the other tape; Plan view of optical module with protective tape according to Embodiment 4 Plan view of optical module with protective tape according to Embodiment 5 Plan view of an optical module with a protective tape according to a first modification of the fifth embodiment Plan view of an optical module with a protective tape according to a second modification of the fifth embodiment Plan view of an optical module with a protective tape according to a sixth embodiment Plan view of an optical module with a protective tape according to a first modification of the sixth embodiment Plan view of an optical module with a protective tape according to a second modification of the sixth embodiment

Hereinafter, a protective tape, an optical module with a protective tape, a method for protecting an optical module, and a method for manufacturing an optical device according to embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

Embodiment 1.
FIG. 1 is an exploded perspective view showing the configuration of an optical module with a protective tape according to Embodiment 1. FIG. 2 is a plan view of the optical module with a protective tape according to Embodiment 1. FIG. 3 is a cross-sectional view of the optical module according to Embodiment 1. FIG. An optical module with protective tape 100 according to Embodiment 1 has an optical module 1 having an optical surface 81 on which light is incident, and a protective tape 10 . The optical surface 81 includes a light transmission portion 50 through which light is transmitted. The protective tape 10 protects the light transmitting portion 50 by preventing foreign matter from adhering to the light transmitting portion 50 . The light transmission portion 50 includes a light transmission portion 51 and a light transmission portion 52 . The protective tape 10 has spacers 12 and adhesive tapes 11 . The spacer 12 is a piece of film cut out from a film and divided into three spacers 12a, 12b and 12c. Although an example in which the spacer 12 is divided into three will be described below, the spacer 12 is not limited to this and may be divided into two. Moreover, the spacer 12 may be divided into four or more. Moreover, the spacer 12 does not have to be divided into a plurality of parts. That is, the spacer 12 may be annular, specifically C-shaped, with one discontinuity.

The optical module 1 is used for an encoder, which is an optical device that optically detects the rotation angle of a servomotor. The optical module 1 includes a module substrate 5 , a light emitting element 3 and a light receiving element 4 mounted on the module substrate 5 , and a transparent resin 6 sealing the light emitting element 3 and the light receiving element 4 . The surface of the transparent resin 6 is the optical surface 81 . The light emitting element 3 and the light receiving element 4 are mounted on the main surface of the module substrate 5 . The transparent resin 6 is arranged on the main surface of the module substrate 5 on which the light emitting element 3 and the light receiving element 4 are mounted. The light receiving element 4 receives light at the light receiving portion 4a. In the optical module 1 , the area of the optical surface 81 of the transparent resin 6 that covers the light emitting element 3 serves as a light transmitting portion 51 through which the light emitted by the light emitting element 3 is transmitted. In the optical module 1, the area of the optical surface 81 of the transparent resin 6 that covers the light receiving portion 4a of the light receiving element 4 serves as a light transmitting portion 52 through which the light incident on the light receiving portion 4a is transmitted.

The size of the light transmitting portion 51 can be set to any size. For example, the size of the light transmitting portion 51 can be the beam diameter at which the intensity of the light emitted from the light emitting element 3 is 1/e ² or the full width at half maximum of the light emitted from the light emitting element 3 .

The light transmitting portions 51 and 52 are set so as to include a light ray path when the light emitted by the light emitting element 3 is reflected by the object to be measured and enters the light receiving element 4 . An object to be measured that reflects the light emitted by the light emitting element 3 is arranged so as to face the optical surface 81 . A measurement object can be exemplified by a pulse disk.

4 and 5 are cross-sectional views of the optical module with protective tape according to the first embodiment. FIG. 4 shows a cross section of the protective tape attached optical module 100 along line IV-IV in FIG. FIG. 5 shows a cross section of the optical module 100 with protective tape along line VV in FIG. The adhesive tape 11 has a two-layer structure of a film layer 11a and an adhesive layer 11b. An adhesive layer 11 b is attached to the optical surface 81 at the outer edge of the adhesive tape 11 . Since the spacer 12 is in contact with the optical surface 81 around the light transmitting portion 50, the adhesive layer 11b and the optical surface 81 are not in contact with each other in the portion of the protective tape 10 covering the light transmitting portion 50. there is Thereby, a space is formed above the light transmitting portion 50 . The space above the light transmitting portion 50 is hereinafter referred to as the non-contact portion 60 .

As shown in FIGS. 1 and 2, spacers 12a, 12b, and 12c are attached to the adhesive layer 11b outside the first region 7 corresponding to the light transmitting portion 50. As shown in FIGS. Specifically, the spacers 12a, 12b, and 12c are attached to the adhesive layer 11b in a layout in which the light transmitting portion 50 is positioned between the spacers 12a, 12b and the spacer 12c. The spacers 12a and 12b are L-shaped, and arranged with corners directed toward the light transmitting portion 50 side. The spacer 12c has a rectangular shape and is slightly longer than the light receiving portion 4a of the light receiving element 4. As shown in FIG. The shapes of the spacers 12a, 12b, and 12c shown here are examples, and the shapes of the spacers 12a, 12b, and 12c are not limited to these. A portion of the adhesive tape 11 sandwiched between a portion where the spacers 12a are attached to the adhesive layer 11b and a portion where the spacers 12b are attached to the adhesive layer 11b has spacers 12a, 12b, and 12c attached. This is the second area 2, which is an area that is not covered. The second area 2 extends from the first area 7 to the outer edge of the adhesive tape 11 . In FIG. 2, the position of the second region 2 is indicated by a dashed line, and the actual second region 2 includes the region indicated by the dashed line in FIG. It is connected to the outer edge of 11. The adhesive tape 11 is separated from the transparent resin 6 in the second region 2 .

The adhesive tape 11 is in a non-contact state with the optical surface 81 up to the outer edge of the adhesive tape 11 in the second region 2 . Therefore, as shown in FIG. 4 , the optical module 100 with the protective tape is formed with a ventilation path portion 61 connecting the outer edge portion of the protective tape 10 to the light transmitting portion 50 . The thickness of the spacers 12a and 12b attached to the adhesive layer 11b with the second region 2 interposed therebetween is set to be smaller than the size of the foreign matter to be suppressed from entering the light transmitting portion 50. As shown in FIG. Therefore, the air passage height of the air passage portion 61 is smaller than the size of the foreign matter to be suppressed from entering the light transmitting portions 51 and 52 . When the spacer 12 is formed in an annular shape with one discontinuity, the thickness of the entire spacer 12 is set to be less than the size of the foreign matter to be suppressed from entering the light transmitting portion 50 . As an example, the foreign matter is assumed to have a longitudinal dimension of 20 μm or more and less than 50 μm, but the longitudinal dimension may be 50 μm or more.

The spacers 12a, 12b, and 12c are arranged at three locations outside the region corresponding to the region where the light transmitting portions 51 and 52 are put together, which are not on the same straight line. Note that the spacers 12 are arranged at three locations outside the region corresponding to the light transmitting portion 51 that are not on the same straight line, and at three locations outside the region corresponding to the light transmitting portion 52 that are not on the same straight line. and may be placed separately. The spacers 12 are separately provided at three locations outside the region corresponding to the light transmitting portion 51 that are not on the same straight line and at three locations outside the region corresponding to the light transmitting portion 52 that are not on the same straight line. When arranged, the air passage portion 61 connected from the outer edge portion of the protective tape 10 to the light transmission portion 51 and the air passage portion 61 connected from the outer edge portion of the protective tape 10 to the light transmission portion 52 are formed separately. be done. The spacers 12 form non-contact portions 60 above the light transmitting portion 50 because the spacers 12 are present at three locations outside the light transmitting portion 50 that are not on the same straight line.

Note that the spacer 12 may overlap the light transmitting portions 51 and 52 as long as the light transmitting portions 51 and 52 and the adhesive layer 11b are not in contact with each other. In addition, since the protective tape 10 is attached to the optical surface 81 with an inclined portion closer to the outer edge than the spacers 12, the adhesive layer 11b and the optical surface 81 are attached to the optical surface 81 in a region slightly larger than the portion where the spacers 12 are arranged. becomes contactless. Therefore, if the optical surface 81 and the adhesive layer 11b are not in contact with each other in the light transmitting portions 51 and 52, part of the light transmitting portions 51 and 52 may protrude from the area surrounded by the spacers 12. FIG.

6 and 7 are diagrams showing the procedure for manufacturing an encoder using the optical module with protective tape according to the first embodiment. As shown in FIG. 6, the optical module 100 with protective tape is mounted on the circuit board 300 by soldering with the protective tape 10 still attached. As shown in FIG. 7, the protective tape 10 is peeled off from the optical module 100 with protective tape mounted on the circuit board 300 . Through the above procedure, the encoder 400, which is the optical device according to the first embodiment, is manufactured. In the encoder 400, the optical module 1 left on the circuit board 300 rotates the servomotor by receiving the reflected light from the measuring object such as the pulse disk by the light receiving element 4 among the light emitted from the light emitting element 3. Detects angles optically. Note that the optical device manufactured using the optical module 100 with protective tape is not limited to the encoder 400 .

Next, an example of the procedure for creating the masking tape 10 will be described. In addition, the procedure for creating the masking tape 10 is not limited to the following procedure. First, the film before processing is attached to the adhesive surface of the carrier tape. Next, the spacer 12 is formed by cutting out the film so as to be located outside the region corresponding to the light transmitting portion 50 by using a mold or laser irradiation. Then, the surplus portion of the film is removed. Next, an adhesive tape is attached to the adhesive side of the carrier tape. Then, the protective tape 10 is produced by cutting the adhesive tape into the shape of the adhesive tape 11 using a mold or laser irradiation. After that, the surplus portion of the adhesive tape is removed. Next, a film for handling is attached to the adhesive surface of the carrier tape. Then, the protective tape 10 is peeled off from the carrier tape together with the handling tape. Next, the protective tape 10 is transferred from the handling tape to the release liner. In the procedure for making the protective tape 10 described above, known materials can be used as materials for the film and the adhesive tape.

Through the above procedure, the protective tape 10 can be formed on the release liner. A step for removing foreign matter or adhesive remaining on the processed cross section may be added between the above steps.

Next, an example of a procedure for attaching the protective tape 10 to the optical module 1 will be described. The procedure for attaching the protective tape 10 to the optical module 1 is not limited to the procedure described below. First, the protective tape 10 is picked up from the release liner with tweezers or a suction nozzle and peeled off. Next, the protective tape 10 is put on the optical module 1 . When accuracy is required for the position where the protective tape 10 is placed, the outer shape of the protective tape 10, the position of the spacer 12, the outer shape of the optical module 1, the position of the light emitting element 3, and the position of the light receiving element 4 are image-recognized. to match the relative positions. Next, the outer peripheral portion of the protective tape 10 is pressed with a stamp. The stamp is hollowed out so as to avoid the light-transmitting portions 51 and 52 and the spacer 12, and presses the protective tape 10 as a whole. Alternatively, a stamp having a shape that is hollowed out so as to avoid the light-transmitting portions 51 and 52 and the spacer 12 is formed of a flexible material such as rubber, and further has a tapered structure in which the center side is pressed first, and the tape is formed from the inside of the protective tape 10. The stamp may be pressed while deforming to expel air outward. It should be noted that rectangular and L-shaped stamps may be combined, and the protective tape 10 may be affixed by successively pressing each side of the outer peripheral portion, four corners, and arbitrary locations.

According to the above procedure, the optical module 100 with protective tape can be produced. The optical module 100 with the protective tape is adhered to the light transmitting portions 51 and 52 by sucking with a nozzle so as to avoid the light transmitting portions 51 and 52, or by holding the side surface with tweezers or a chuck tool. 11 can be handled without contact.

A method of peeling off the protective tape 10 from the optical module 1 will be described. As a method for peeling the protective tape 10 from the optical module 1, three methods can be exemplified. In the first method, a peeling tape is attached to the entire surface of the film layer 11a of the adhesive tape 11, and the protective tape 10 is peeled off from a corner or one side. When the protective tape 10 is peeled off from the optical module 1 by the first method, the load is applied only to the non-contact portion 60 so that the non-contact portion 60 is crushed and the adhesive tape 11 is not brought into contact with the light transmission portion 50 . Avoid getting caught. Alternatively, the application of a load to the protective tape 10 is suppressed as much as possible. In the second method, the peeling tape is attached only to the corner or one side of the protective tape 10, and then gradually peeled off from the corner or one side. In the third method, part of the adhesive tape 11 is allowed to protrude outside, and is peeled off by pinching with tweezers.

When peeling the protective tape 10 from the optical module 1 and when handling the optical module 100 with the protective tape, if the non-contact portion 60 is not crushed, protection including the upper side of the light transmitting portions 51 and 52 is required. A nozzle that contacts the entire surface of the tape 10 may be used.

Since the optical module 100 with protective tape according to Embodiment 1 includes the air passage portion 61 that connects the outer edge portion of the protective tape 10 to the light transmission portion 50 , the gas generated from the transparent resin 6 flows out of the non-contact portion 60 . can be released. Therefore, it is possible to suppress peeling of the protective tape 10 due to an increase in pressure inside the non-contact portion 60 in a high-temperature environment. In addition, the optical module 100 with protective tape according to the first embodiment can prevent the protective tape 10 from sticking to the light transmitting section 50 due to a decrease in pressure inside the non-contact portion 60 during cooling after heating. . In addition, since the protective tape 10 according to Embodiment 1 can be produced by combining the adhesive tape 11 and the spacers 12, it is easy to improve the accuracy of the dimensions, shape and arrangement of the spacers 12. . Moreover, since the combination of the adhesive tape 11 and the spacer 12 of the protective tape 10 according to the first embodiment can be easily changed in accordance with the specifications such as the dimensions and material of the optical module 1, even a small lot can be manufactured at low cost. . Moreover, the protective tape that forms the air passage portion when attached to the optical module 1 can be made by removing a part of the adhesive layer of the adhesive tape. can be produced by combining the adhesive tape 11 and the spacer 12, it can be produced at a lower cost than the protective tape that removes part of the adhesive layer of the adhesive tape.

Embodiment 2.
8 is a plan view of a masking tape according to Embodiment 2. FIG. The masking tape 10 according to Embodiment 2 differs from Embodiment 1 in that cuts 71 are formed in the adhesive tape 11 on the outer edge side of the region where the spacers 12 are attached.

A portion of the adhesive tape 11 closer to the outer edge than the area where the spacer 12 is attached is likely to wrinkle when the protective tape 10 is attached to the optical module 1 . Moreover, when the adhesive strength of the adhesive tape 11 is small, springback occurs in the deformed portion of the adhesive tape 11, and the adhesive portion is peeled off. Therefore, by forming the notch 71 in the portion of the adhesive tape 11 closer to the outer edge than the area where the spacer 12 is attached, the protective tape 10 is wrinkled when the protective tape 10 is attached to the optical module 1. can be made difficult. By reducing the deformed portion, springback can be reduced and peeling can be suppressed.

FIG. 9 is a plan view of a masking tape according to a first modification of Embodiment 2. FIG. The position and number of the cuts 71 can be arbitrarily changed as long as wrinkles are less likely to occur when attached to the optical module 1 . 10 is a plan view of a protective tape according to a second modification of Embodiment 2. FIG. FIG. 11 is a plan view of a masking tape according to a third modified example of the second embodiment. By forming the notch 72 in the portion of the adhesive tape 11 closer to the outer edge than the region where the spacer 12 is attached, wrinkles are less likely to occur when the adhesive tape 11 is attached to the optical module 1, and peeling is prevented. can be suppressed.

8 to 11, when a plurality of notches 71 or notches 72 are formed in the adhesive tape 11, the direction in which the notches 71 or notches 72 extend is aligned so that the protective tape 10 can be attached to the optical module. It is possible to prevent the protective tape 10 from being cut when it is peeled off from the tape 1.例文帳に追加

Embodiment 3.
12 is a plan view of an optical module with a protective tape according to Embodiment 3. FIG. 13 is a cross-sectional view of an optical module with a protective tape according to Embodiment 3. FIG. In the optical module 100 with a protective tape according to the third embodiment, the spacer 12 is thicker than the first spacer 16 and between the first spacer 16 sandwiching the second region 2 . It is different from the first embodiment in that it includes a second spacer 13 attached to the adhesive layer 11b so that the first region 7 is positioned. That is, the second spacer 13 is attached to the adhesive layer 11b so that the first region 7 is positioned between the second spacer 13 and the region to which the first spacer 16 is attached. The first spacer 16 is divided into two first spacers 16a and 16b. The second spacer 13 is divided into second spacers 13a, 13b and 13c. The second spacers 13a and 13b are attached to the adhesive layer 11b so that the portions of the first region 7 corresponding to the light transmitting portions 51 are positioned between the second spacers 13a and 16b and the first spacers 16a and 16b. . The second spacer 13c is attached to the adhesive layer 11b so that the portion of the first region 7 corresponding to the light transmitting portion 52 is located between the first spacers 16a and 16b.

The second spacer 13 c has a rectangular shape and is slightly longer than the light receiving portion 4 a of the light receiving element 4 . The second spacers 13a and 13b are rectangular and arranged side by side on the same straight line. The second spacer 13c is attached to the adhesive layer 11b so that the portion of the first region 7 corresponding to the light transmitting portion 52 is positioned between the second spacers 13a and 13b. Therefore, the second spacers 13a, 13b and the second spacer 13c are arranged at three locations outside the region corresponding to the light transmitting portion 51, which are not on the same straight line. The length of the second spacers 13a and 13b arranged side by side, that is, the length of the second spacer 13a, the length of the second spacer 13b, and the length of the gap between the second spacer 13a and the second spacer 13b is the same as that of the second spacer 13c.

An example of the procedure for creating the masking tape 10 will be described. 14 to 30 are diagrams showing the procedure for creating the masking tape according to the third embodiment. In addition, the procedure for creating the masking tape 10 is not limited to the following procedure. First, as shown in FIG. 14, the unprocessed film 120 is attached to the adhesive surface of the carrier tape 150 . Next, as shown in FIG. 15, the film 120 is cut out at an arbitrary position and shape using a mold or laser irradiation to create the first spacers 16 . Next, as shown in FIG. 16, a first structure 201 is created by removing unnecessary portions 121 which are regions other than the first spacers 16 cut out from the film 120 .

Subsequently, as shown in FIG. 17, the thick film 130 before processing is attached to the adhesive surface of the carrier tape 151 . Next, as shown in FIG. 18, the thick film 130 is cut out at an arbitrary position and shape using a mold or laser irradiation to form the second spacers 13 . Next, as shown in FIG. 19, a second structure 202 is formed by removing unnecessary portions 131 which are regions other than the second spacers 13 cut out from the thick film 130 .

Next, as shown in FIG. 20, a carrier tape 152 is attached to the surface of the carrier tape 151 to which the second spacers 13 are attached. Then, as shown in FIG. 21, the carrier tape 151 is removed from the second structure 202 having the carrier tape 152 attached to the surface on which the second spacer 13 is attached. As a result, a third structure 203 in which the second spacers 13 are arranged on one side of the carrier tape 152 is formed.

Next, as shown in FIG. 22, the third structure 203 is positioned so that the second spacer 13 is on the adhesive side of the carrier tape 150, and the third structure 203 is adhered to the first structure 201. A fourth structure 204 is created. Then, as shown in FIG. 23, the carrier tape 152 is removed from the fourth structure 204 to create a fifth structure 205 . Next, as shown in FIG. 24, an unprocessed adhesive tape 110 is attached to the fifth structure 205 . Then, as shown in FIG. 25, an adhesive tape 11 is formed by cutting out the adhesive tape 110 into an arbitrary shape using a mold or laser irradiation. If floating of the adhesive tape 110 is a problem when cutting the adhesive tape 110, a step of adhering the adhesive tape 11 to the first spacer 16 or the carrier tape 150 may be performed before the step of cutting the adhesive tape 11. do it. Next, as shown in FIG. 26, the unnecessary portion 111 of the adhesive tape 110 is removed. A step for removing foreign matter or adhesive remaining on the processed cross section may be added between the above steps, or the tape may be produced by a procedure different from the above procedure.

Next, as shown in FIG. 27, a carrier tape 153 is adhered onto the adhesive tape 11 to form a sixth structure 206 . Next, as shown in FIG. 28, carrier tape 150 is removed from sixth structure 206 to create seventh structure 207 . Then, as shown in FIG. 29, the seventh structure 207 is adhered to the release liner 170 to form the eighth structure 208 . After that, the carrier tape 153 is removed from the eighth structure 208, as shown in FIG.

The following two methods can be exemplified as a method of leaving a tape or film cut out from adhesive tapes on an arbitrary adhesive surface side. In the first method, the tapes are made to have different adhesive strengths. To give a specific example, a highly adhesive tape is used on the side on which the cut tape or film is to be left. A difference in adhesive strength between tapes can also be provided by using a tape whose adhesive strength is reduced by irradiating one of the tapes with ultraviolet rays or visible light.

In the second method, the tape on the side to be peeled is pulled while being bent at a peeling edge or the like, leaving the cut tape or film on the other tape. FIG. 31 is a diagram showing a method of leaving the tape or film cut out during the production of the masking tape according to Embodiment 3 on the other tape. In the example shown in FIG. 31, the peeling edge 200 is pressed against the non-adhesive side of the carrier tape 152 on the peeling side of the fourth structure 204, and the portion of the carrier tape 152 against which the peeling edge 200 is pressed is sharp or sharp. It is bent at a right angle. At this time, if the rigidity of the second spacer 13 is stronger than the adhesive force of the carrier tape 152, the second spacer 13 will not deform at an acute angle or right angle when the carrier tape 152 is bent at an acute angle or right angle. Then, the carrier tape 152 is peeled off and remains on the carrier tape 150 side.

Instead of sticking the tapes together, the cut tape or film may be temporarily peeled off from the carrier tape, picked up by a tool such as a suction nozzle, and positioned by image recognition before being stuck.

In the optical module with protective tape 100 according to Embodiment 3, the first spacers 16 sandwiching the second region 2 forming the air passage portion 61 are arranged outside the region corresponding to the light transmitting portion 50 . 2, the distance between the adhesive tape 11 and the optical surface 81 in the non-contact portion 60 can be increased without increasing the air passage height of the air passage portion 61 . Therefore, it is possible to provide a structure in which foreign matter is less likely to enter the light transmitting portion 50 and the adhesive is less likely to adhere to the light transmitting portion 50 .

Embodiment 4.
32 is a plan view of an optical module with a protective tape according to Embodiment 4. FIG. The optical module with protective tape 100 according to Embodiment 4 is similar to that according to Embodiment 1 in that the gas venting portion 73 penetrating through the adhesive tape 11 is provided in the portion of the protective tape 10 that covers the light transmission portion 50 . It differs from the optical module 100 with protective tape. Here, the case where the degassing portion 73 has a circular hole shape is taken as an example, but the degassing portion 73 may be a simple notch.

Since the optical module 100 with protective tape according to the fourth embodiment can release gas from the gas venting portion 73 in addition to the ventilation path portion 61, even if the amount of gas generated from the transparent resin 6 is large, the light transmitting portion 50 can be suppressed from being soiled.

Embodiment 5.
33 is a plan view of an optical module with a protective tape according to Embodiment 5. FIG. The optical module 100 with protective tape according to the fifth embodiment is different from the optical module 100 with protective tape according to the first embodiment in that it has a peel starting film 14 . That is, the masking tape 10 according to Embodiment 5 includes the peel starting film 14 . The peel starting point film 14 is provided on the outer edge of the protective tape 10 for the purpose of improving the peelability of the protective tape 10 . The peel starting point film 14 is attached to the adhesive layer 11 b on the outer edge of the adhesive tape 11 . The adhesive force per unit area of the protective tape 10 at the portion where the peel starting film 14 is provided is weaker than the adhesive force per unit area at the portion where the adhesive tape 11 is attached to the transparent resin 6. .

34 is a plan view of an optical module with a protective tape according to a first modification of the fifth embodiment; FIG. As shown in FIG. 34 , the peel starting film 14 may be provided at the corner of the protective tape 10 . 35 is a plan view of an optical module with a protective tape according to a second modification of the fifth embodiment; FIG. As shown in FIG. 35, the peel starting point films 14 may be provided at two or more locations. Note that the peel starting point film 14 may be provided at a portion different from the portion illustrated here.

When the peel starting film 14 is attached to the adhesive surface of the adhesive tape 11, the peel starting film 14 is formed in a polygonal shape. It is desirable that the peel start film 14 has a shape and an attachment position such that the unpeeled portion adhering to the transparent resin 6 gradually increases when the protective tape 10 is gradually peeled from the edge. For example, when the protective tape 10 shown in FIG. 35 is peeled from right to left in FIG. 35, the unpeeled portion gradually increases, so the protective tape 10 should be peeled in this direction. is preferred.

When the peel starting film 14 has the same thickness as the film 120 or the thick film 130 , the peel starting film 14 can be formed in the same process as the spacer 12 . Note that the peel starting film 14 may be made of a material different from that of the spacer 12 . Also, the peel starting film 14 may be formed by cutting out the film 120 and the thick film 130 so as to join them together.

Also, an adhesive tape having a weak adhesive force may be used instead of the peel starting film 14 . In this case, the adhesive surface of the adhesive tape for starting peeling may be on the optical module 1 side or on the adhesive layer 11b side of the adhesive tape 11 .

Since the optical module 100 with protective tape according to the fifth embodiment includes the peel starting point film 14 , the protective tape 10 can be easily peeled off from the optical module 1 .

Embodiment 6.
36 is a plan view of an optical module with a protective tape according to Embodiment 6. FIG. The optical module with protective tape 100 according to the sixth embodiment differs from the optical module with protective tape 100 according to the first embodiment in that it has a folded portion 15 . That is, the protective tape 10 according to Embodiment 6 has the same structure as the protective tape 10 according to Embodiment 1, but the outer edge part is folded back so that the film layers 11a overlap each other. It differs from the first embodiment in that it is attached to the module 1 .

37 is a plan view of an optical module with a protective tape according to a first modification of Embodiment 6. FIG. As shown in FIG. 37, the folded portion 15 may be provided at the corner of the masking tape 10 . 38 is a plan view of an optical module with a protective tape according to a second modification of the sixth embodiment; FIG. As shown in FIG. 38, two or more folded portions 15 may be provided. Note that the folded portion 15 may be provided at a portion different from the portion illustrated here.

In the optical module 100 with protective tape according to Embodiment 6, since the protective tape 10 is not attached to the transparent resin 6 at the folded portion 15 , the protective tape 10 can be easily removed by gripping the folded portion 15 . 1 can be removed.

In each of the embodiments described above, the optical module 1 is for detecting the rotation angle of the servomotor, but the optical module 1 may be an imaging device, an image sensor, or a lens barrel. In addition to the structure in which one light-emitting element 3 and one light-receiving element 4 are mounted, a structure in which a plurality of light-emitting elements 3 and light-receiving elements 4 are respectively mounted may be used, or only one of them may be mounted. may be configured.

Moreover, the spacer 12 and the peel starting point film 14 may be composed of a foil-like material other than a film, such as an adhesive tape, a piece of metal, a piece of resin, or paper.

The configuration shown in the above embodiment shows an example of the content of the present invention, and it is possible to combine it with another known technology, and one configuration can be used without departing from the scope of the present invention. It is also possible to omit or change the part.

REFERENCE SIGNS LIST 1 optical module 2 second region 3 light emitting element 4 light receiving element 4a light receiving section 5 module substrate 6 transparent resin 7 first region 10 protective tape 11 adhesive tape 11a film layer 11b adhesive Layer 12, 12a, 12b, 12c Spacer 13, 13a, 13b, 13c Second spacer 14 Peeling starting point film 15 Folding part 16, 16a, 16b First spacer 50, 51, 52 Light transmitting part , 60 non-contact part 61 ventilation path part 71 notch 72 notch 73 degassing part 81 optical surface 100 optical module with protective tape 110 adhesive tape 111, 121, 131 unnecessary part 120 film 130 thick film, 150, 151, 152, 153 carrier tape, 170 release liner, 200 release edge, 201 first structure, 202 second structure, 203 third structure, 204 fourth structure, 205 fifth structure, 206 sixth structure, 207 seventh structure, 208 eighth structure, 300 circuit board, 400 encoder.

Claims (8)

A protective tape that is attached to an optical surface of an optical module and prevents foreign matter from adhering to a light-transmitting portion of the optical surface,
an adhesive tape having an adhesive layer on one side;
a spacer attached to the adhesive layer in a portion outside a first region, which is a region corresponding to the light transmitting portion;
The adhesive tape has a second area where the spacer is not attached and is connected from the first area to the outer edge of the adhesive tape ,
The spacer includes a first spacer attached to the adhesive layer with the second region interposed therebetween;
and a second spacer that is thicker than the first spacer and attached to the adhesive layer such that the first area is positioned between the area to which the first spacer is attached. A protective tape characterized by: 2. The protective tape according to claim 1, wherein the adhesive tape has a notch or a notch formed on the outer edge side of the region where the spacer is attached. 3. The protective tape according to claim 1, wherein a gas venting portion penetrating the adhesive tape is formed in a portion covering the light transmitting portion. 4. The protective tape according to any one of claims 1 to 3 , wherein a peel starting point film is attached to the adhesive layer on the outer edge of the adhesive tape. an optical module comprising an optical surface having a light transmitting portion;
An optical module with a protective tape, comprising the protective tape according to any one of claims 1 to 4 attached to the optical surface. 5. A method for protecting an optical module, comprising applying the protective tape according to any one of claims 1 to 4 to an optical surface of the optical module. 4. A method for protecting an optical module, wherein the protective tape according to any one of claims 1 to 3 is adhered to the optical surface of the optical module while part of the outer edge of the adhesive tape is folded back. . a step of mounting the optical module with protective tape according to claim 5 on a circuit board;
and peeling off the protective tape from the optical module with the protective tape mounted on the circuit board.

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