Adhesive structure of optical device, adhesion method, and optical pickup device
AssigneeHitachi Media Electronics Co., Ltd.
InventorsAkiko Mizushima, Hiroaki Furuichi, Kazuhiko Ito, Ryuichiro Mizuno, Tamotsu Nishida
Life of this patent
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Abstract
In an optical pickup device for use in recording and reproducing on an optical recording medium, such as a CD or DVD, banks are formed on both sides of an adhesive agent application position for adhering an optical device, such as a photodetector or a laser diode, in an optical pickup case. At this time, a bank on the side of an optical path is formed higher than a height of an outer bank, and an adhesive agent is poured between the banks, to adhere the optical pickup case and the optical device.
Claims9
An adhesive structure of an optical device, comprising:
- a case which has an adhesive joint to adhere the optical device;
- an optical device which is held by a holder and adjusted in accordance with relative positioning with the case so that an adhesive joint is opposed to the adhesive joint of the case to which an adhesive agent is applied and optically optimum sensitivity is attained for light passing through an optical path connected to the case;
- and
- an adhesive agent which is provided between the adhesive joint of the case and the adhesive joint of the optical device held by the holder, and which is formed by pressing into a predetermined thickness and hardened by ultraviolet rays, and
- wherein a plurality of pairs of banks are formed in positions between which an adhesive agent application area of the adhesive joint of the case is formed, and a height of a bank on a side of an optical path is higher than a height of other bank, in each pair of banks, and
- the adhesive agent which is pressured in accordance with a relative positioning operation of the case and the optical device held by the holder is hardened in a state where it overflows over the other bank and is spread between the both adhesive joints.
An optical pickup device comprising:
- a light emitting device which emits light;
- a photodetector which receives light;
- an object lens;
- and
- an optical pickup case which leads light emitted from the light emitting device to the object lens, and includes various optical parts for converging light onto an optical disk and various optical parts for causing light reflected from the optical disk to be focused on the photodetector, and
- wherein a plurality of pairs of banks are formed in positions between which an adhesive agent application area is formed, on an adhesive joint for adhering the light emitting device or the photodetector of the optical pickup case, and in the plurality of banks, a height of a bank on a side of an optical path is higher than a height of other outer bank, and
- the adhesive joint of the light emitting device or the photodetector held by a holder is opposed to an adhesive joint of the optical pickup case onto which an adhesive agent is applied, and the adhesive agent pressured in accordance with a relative positioning operation of the adhesive joint of the optical pickup case and the adhesive joint of the light emitting device or the photodetector held by the holder is hardened in a state where it overflows over the other outer bank and is spread between the both adhesive joints, to attain optically optimum sensitivity for light passing through an optical path connected to the case.
An adhesion method for an optical device, having the steps of causing an adhesive joint on a side of an optical device held by a holder to be opposed to an adhesive joint for adhering an optical device of a case, applying an adhesive agent onto the adhesive joint of the case, and, to attain optically optimum sensitivity for light passing through an optical path toward the optical device from the case, adjusting relative positioning of the case and the optical device held by the holder and hardening the adhesive agent between both of the adhesive joints, the method comprising the steps of:
- forming a plurality of pairs of banks in which a height of a bank on the side of the optical path is higher than a height of other outer bank, in positions between which an adhesive agent application area of the adhesive joint of the case is formed, and
- hardening the adhesive agent pressured in accordance with a relative positioning operation of the case and the optical device held by the holder, in a state where it overflows over the other outer bank and is spread between the both adhesive joints.
Dependencies are inferred from the claim text.