Light-projecting device
A light-projecting device includes a light source that emits a light, and a scanner that performs a first scan of the light in a first direction and a second direction opposed to the first direction, and performs a second scan of the light in a direction orthogonal to the first direction. The scanner performs the second scan while the scanner is swinging in a first angle range when the scanner performs the first scan in the first direction. The scanner performs the second scan while the scanner is swinging in a second angle range that is greater than the first angle range when the scanner performs the first scan in the second direction.
1. A light-projecting device, comprising:
a light source that emits a light; and
a first light-receiving Integrated Circuit (IC) that detects a light quantity of the light emitted from the light source;
a controller that controls the light source based on a detection result of the first light-receiving IC,
a scanner that:
comprises a mirror that reflects the light and swings based on a control signal transmitted from the controller;
performs a first scan of the light in a first direction and in a second direction opposed to the first direction; and
performs a second scan of the light in a direction orthogonal to the first direction,
wherein the scanner performs the second scan while the mirror is swinging in a first angle range when the scanner performs the first scan in the first direction,
wherein the scanner performs the second scan while the mirror is swinging in a second angle range that is greater than the first angle range when the scanner performs the first scan in the second direction, and
wherein, while the scanner is performing the first scan in the second direction, the controller:
causes the light source to emit the light when the scanner performs the second scan at a first swinging angle of the mirror that is inside the second angle range and outside the first angle range, and
does not cause the light source to emit the light when the scanner performs the second scan at a second swinging angle of the mirror that is inside both the first angle range and the second angle range.
2. The light-projecting device according to claim 1 , wherein the first direction in the first scan is outbound and the second direction in the first scan is inbound.
3. The light-projecting device according to claim 1 , wherein the scanner causes the second angle range to approach the first angle range during the first scan in the second direction.
4. The light-projecting device according to claim 1 , wherein the scanner causes the first angle range to approach the second angle range during the first scan in the first direction.
5. The light-projecting device according claim 1 , wherein the first light-receiving IC detects the light quantity when the second angle range is no less than a threshold angle range.
6. The light-projecting device according to claim 5 , wherein a time period until the second angle range becomes greater than or equal to the threshold angle range is longer than a first time period and no more than a second time period.
7. The light-projecting device according claim 1 ,
wherein the light from the mirror is projected toward a projection surface that comprises a display region and a non-display region outside the display region,
wherein the second scan is performed in the first angle range in the display region, and
wherein the non-display region comprises a first region and a second region,
the light-projecting device further comprising:
a second light-receiving IC that detects the light projected to the first region; and
a third light-receiving IC that detects the light projected to the second region,
wherein the controller detects the light quantity in a period from when the second light-receiving IC detects the light until the third light-receiving IC detects the light.
8. The light-projecting device according claim 1 , further comprising:
a light-blocking frame that blocks the light projected to a non-display region,
wherein the light from the mirror is projected toward a projection surface that comprises a display region and the non-display region outside the display region, and
wherein the second scan is performed in the first angle range in the display region.
9. The light-projecting device according to claim 7 , further comprising:
a light-blocking frame that blocks the light projected to the non-display region,
wherein the light-blocking frame comprises the second light-receiving IC and the third light-receiving IC, and
wherein each of the second light-receiving IC and the third light-receiving IC is a light-detecting element.
10. The light-projecting device according claim 1 , wherein the scanner performs the second scan while the scanner is swinging in a third angle range that is smaller than the first angle range.
11. The light-projecting device according to claim 10 , further comprising:
an input unit that accepts an input,
wherein the third angle range is determined based on the input.
12. The light-projecting device according to claim 3 , wherein the scanner causes the first angle range to approach the second angle range during the first scan in the first direction.