JP2001143305A5 - - Google Patents

Claims (14)

A plurality of light sources that are selectively driven to emit light sources having different wavelengths, a wavelength synthesis prism that synthesizes the light sources emitted from these light sources toward the optical recording medium as irradiation light, and this wavelength synthesis In an optical pickup device comprising: an objective lens that condenses the irradiation light that has passed through the prism on the optical recording medium; and a signal detection light receiving element that receives reflected light reflected from the optical recording medium.
An optical pickup characterized in that the light source light reflected by one surface of the wavelength combining prism other than the irradiation light is received as a monitor light by a monitor light receiving element and the corresponding light source light of the light source is monitored. apparatus. 2. The optical pickup device according to claim 1, wherein the monitor light receiving element receives light source light reflected by a surface portion of the wavelength synthesizing prism on the objective lens side as monitor light. 3. The optical pickup device according to claim 2, wherein the signal detection light receiving element and the monitor light receiving element corresponding to each of the light sources are provided on the same substrate. 3. The optical pickup device according to claim 2, wherein each of the light sources, the signal detection light-receiving element corresponding to the light source, and the monitor light-receiving element are provided on the same substrate. 2. The optical pickup device according to claim 1, wherein the monitor light receiving element receives light source light reflected by a surface portion on the light source side of the wavelength combining prism as monitor light. The incident angle of the light source light from each light source to the surface portion on the light source side in the wavelength combining prism is 45 ° or less, and the signal detection light receiving element and the monitor light receiving element corresponding to each light source are the same. 6. The optical pickup device according to claim 5, wherein the optical pickup device is provided on a substrate. The incident angle of the light source light from each light source with respect to the light source side surface portion of the wavelength combining prism is 45 ° or less, and each light source, the signal detection light receiving element corresponding to the light source, and the monitor light receiving element 6. The optical pickup device according to claim 5, wherein and are provided on the same substrate. A light source, a coupling lens for guiding light source light emitted from the light source toward the optical recording medium as irradiation light, a prism, and an objective for condensing the irradiation light passing through the prism on the optical recording medium In an optical pickup device comprising a lens and a signal detection light receiving element that receives reflected light reflected from the optical recording medium,
An optical pickup device characterized in that the light source light reflected by one surface of the prism is received as a monitor light by a monitor light receiving element through the coupling lens and the light source light of the light source is monitored. 9. The optical pickup device according to claim 8, wherein the monitor light receiving element receives light source light reflected by a surface portion of the prism on the objective lens side as monitor light. 10. The optical pickup device according to claim 9, wherein the signal detection light receiving element and the monitor light receiving element are provided on the same substrate. 10. The optical pickup device according to claim 9, wherein the light source, the signal detection light receiving element, and the monitor light receiving element are provided on the same substrate. 9. The optical pickup device according to claim 8, wherein the light-receiving element for monitoring receives light source light reflected by a surface portion on the light source side of the prism as monitor light. The incident angle of the light source light from each light source with respect to the surface portion on the light source side of the prism is 45 ° or less, and the signal detection light receiving element and the monitor light receiving element are provided on the same substrate. The optical pickup device according to claim 12. From the light source to the light source side surface portion of the prism 13. The optical pickup device according to claim 12, wherein the incident angles of the light source light are 45 ° or less, and the light source, the signal detection light receiving element, and the monitor light receiving element are provided on the same substrate. .