JP2005332565A5 - - Google Patents

Claims (20)

A first light source that emits light having a first wavelength;
A light emitting element comprising: a second light source that emits light having a second wavelength different from the first wavelength;
The first light source and the second light source are arranged in the same housing,
When the horizontal radiation angle of the light emitted from the first light source is θh1 (full width at half maximum) and the horizontal radiation angle of the light emitted from the second light source is θh2 (full width at half maximum), θh1 / A light emitting element that satisfies the relationship θh2> 1.1 .   The light emitting element according to claim 1, satisfying a relationship of θh1 / θh2> 1.3.   2. The light emitting element according to claim 1, wherein the maximum rated light output of the first light source is P <b> 1 and the maximum rated light output of the second light source is P <b> 2, satisfying a relationship of P <b> 2> P <b> 1.   2. The light emitting element according to claim 1, wherein a wavelength λ <b> 1 of the first light source and a wavelength λ <b> 2 of the second light source satisfy a relationship of λ <b> 2> λ <b> 1.   2. The light emitting element according to claim 1, wherein an interval between a light emitting point of the first light source and a light emitting point of the second light source is 150 μm or less.   The light emitting element according to claim 1, wherein the θh2 is 7 ° or less.   The light emitting element according to claim 1, wherein the θh1 is 10 ° or more and the θh2 is 8 ° or less.   When the vertical emission angle of light emitted from the first light source is θv1 (full width at half maximum) and the vertical emission angle of light emitted from the second light source is θv2 (full width at half maximum), θv1> The light emitting element according to claim 1, satisfying a relationship of θv2.   At least one of the first light source and the second light source is the same substrate as a substrate on which a photodetector for receiving reflected light obtained by reflecting light emitted from the corresponding light source is disposed. The light emitting element according to claim 1, which is disposed on the top. A light emitting element having a plurality of light sources;
An objective lens for condensing light from the plurality of light sources onto a recording medium;
A collimating lens that converts light from the plurality of light sources into substantially parallel light;
An information processing apparatus comprising a photodetector that receives reflected light from the recording medium,
The plurality of light sources includes a first light source that emits light having a first wavelength, and a second light source that emits light having a wavelength different from the first wavelength;
The first light source and the second light source are arranged in the same housing,
When the horizontal radiation angle of the light emitted from the first light source is θh1 (full width at half maximum) and the horizontal radiation angle of the light emitted from the second light source is θh2 (full width at half maximum), θh1> satisfying the relationship of θh2,
When the focal length of the collimating lens is fc and the focal length of the objective lens is fo, the collimating lens and the objective lens have the optical magnification fc / fo of the light from the first light source. An information processing apparatus configured to optimize light collection performance when collecting light on a recording medium. The information processing apparatus according to claim 10 , wherein a value of the optical magnification fc / fo is 6.5 or less. The information processing apparatus according to claim 10 , satisfying a relationship of θh1 / θh2> 1.1. The information processing apparatus according to claim 10 , satisfying a relationship of θh1 / θh2> 1.3. The information processing apparatus according to claim 10 , wherein the maximum rated light output of the first light source is P1 and the maximum rated light output P2 of the second light source is P1, satisfying a relationship of P2> P1. 11. The information processing apparatus according to claim 10 , wherein a wavelength λ1 of the first light source and a wavelength λ2 of the second light source satisfy a relationship of λ2> λ1. The information processing apparatus according to claim 10 , wherein an interval between a light emitting point of the first light source and a light emitting point of the second light source is 150 μm or less. The information processing apparatus according to claim 10 , wherein the θh2 is 7 ° or less. The information processing apparatus according to claim 10 , wherein the θh1 is 10 ° or more and the θh2 is 8 ° or less. When the vertical emission angle of light emitted from the first light source is θv1 (full width at half maximum) and the vertical emission angle of light emitted from the second light source is θv2 (full width at half maximum), θv1> The information processing apparatus according to claim 10 , wherein the information processing apparatus satisfies the relationship θv2. The information processing apparatus according to claim 10 , wherein at least one of the plurality of light sources is disposed on the same substrate as the substrate on which the photodetector is disposed.