We claim:
1. A lamp module used in a back light device, comprising:
a resilient holder having an accommodation portion;
a lamp tube having one end accommodated in said accommodation portion of said resilient holder; and
a support unit having a reception portion provided to engage with said resilient holder.
2. The lamp module of claim 1, wherein said accommodation portion of said resilient holder is a cavity.
3. The lamp module of claim 1, wherein said reception portion of said support unit is a groove.
4. The lamp module of claim 3, wherein said resilient holder includes a plug portion for engaging with said groove of said support unit.
5. The lamp module of claim 4, wherein said resilient holder further includes a first clamp portion and a second clamp portion, said plug portion is positioned between said first and second clamp portions, and said plug portion is constrained by said first and second clamp portions when said resilient holder engages with said support unit.
6. The lamp module of claim 5, wherein said first clamp portion has a first thickness and said plug portion has a second thickness, and said first thickness is larger than said second thickness.
7. The lamp module of claim 6, wherein said first thickness is about 1.5 to 2 times larger than said second thickness.
8. The lamp module of claim 1, wherein said resilient holder includes a channel for allowing a cable to pass through to connect to said lamp tube.
9. The lamp module of claim 1, wherein a ditch is formed on one side of said support unit to dissipate heat.
10. The lamp module of claim 9, wherein a heat conductive element is disposed in said ditch to dissipate heat.
11. The lamp module of claim 10, wherein said heat conductive element is made of metal.
12. The lamp module of claim 11, wherein said heat conductive element is a copper rod.
13. A lamp module, used in a direct type back light device, comprising:
a resilient holder having a cavity and a plug portion;
a lamp tube having one end accommodated in said cavity of said resilient holder; and
a support unit having a groove provided to engage with said plug portion of said resilient holder.
14. The lamp module of claim 13, wherein said resilient holder further includes a first clamp portion and a second clamp portion, said plug portion is arranged between said first and second clamp portions, and said plug portion is constrained by said first and second clamp portions when said resilient holder engages with said support unit.
15. The lamp module of claim 14, wherein said first clamp portion has a first thickness and said plug portion has a second thickness, and said first thickness is larger than said second thickness.
16. The lamp module of claim 15, wherein said first thickness is about 1.5 to 2 times larger than said second thickness.
17. The lamp module of claim 13, wherein said resilient holder includes a channel for allowing a cable to pass through to connect said lamp tube.
18. The lamp module of claim 13, wherein a ditch is positioned on one side of said support unit to dissipate heat.
19. The lamp module of claim 18, wherein a heat conductive element is disposed in said ditch to dissipate heat.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A light-emitting element comprising:
a semiconductor substrate;
an island structure formed on the semiconductor substrate and including at least a current confining layer and p-type and n-type semiconductor layers;
a light-emitting thyristor formed in the island structure and comprising a pnpn structure; and
a shift thyristor formed in the island structure and comprising a pnpn structure, wherein
the island structure defines n groove portions that are completely surrounded by side surfaces of the island structure so that each groove portion of the n groove portions correspond to holes defined in the island structure, wherein each groove portion of the n groove portions comprises a depth that reaches at least the current confining layer and each groove portion of the n groove portions is formed between a formation region of the shift thyristor of the island structure and a formation region of the light-emitting thyristor, and
an oxidized region that is selectively oxidized from a side surface of the island structure and a side surface of the groove portion is formed in the current confining layer.
2. The light-emitting element according to claim 1, wherein
the groove portion extends toward a side from opposing side surfaces of the island structure.
3. The light-emitting element according to claim 1, wherein
the n groove portions are disposed at equal intervals.
4. The light-emitting element according to claim 1, wherein
the groove portion extends toward the inner side from any one of opposing side surfaces of the island structure.
5. The light-emitting element according to claim 1, wherein
a non-oxidized region which is surrounded by an oxidized region that is oxidized from the side surface of the island structure and the side surface of the groove portion is formed in the current confining layer in the formation region of the light-emitting thyristor.
6. The light-emitting element according to claim 2, wherein
a non-oxidized region which is surrounded by an oxidized region that is oxidized from the side surface of the island structure and the side surface of the groove portion is formed in the current confining layer in the formation region of the light-emitting thyristor.
7. The light-emitting element according to claim 3, wherein
a non-oxidized region which is surrounded by an oxidized region that is oxidized from the side surface of the island structure and the side surface of the groove portion is formed in the current confining layer in the formation region of the light-emitting thyristor.
8. The light-emitting element according to claim 4, wherein
a non-oxidized region which is surrounded by an oxidized region that is oxidized from the side surface of the island structure and the side surface of the groove portion is formed in the current confining layer in the formation region of the light-emitting thyristor.
9. The light-emitting element according to claim 1, further comprising:
a gate electrode shared with the light-emitting thyristor and formed in the formation region of the shift thyristor of the island structure.
10. The light-emitting element according to claim 2, further comprising:
a gate electrode shared with the light-emitting thyristor and formed in the formation region of the shift thyristor of the island structure.
11. The light-emitting element according to claim 3, further comprising:
a gate electrode shared with the light-emitting thyristor and formed in the formation region of the shift thyristor of the island structure.
12. The light-emitting element according to claim 4, further comprising:
a gate electrode shared with the light-emitting thyristor and formed in the formation region of the shift thyristor of the island structure.
13. The light-emitting element according to claim 9, further comprising:
a diode formed in the island structure in a region of a pn layer separated from the light-emitting thyristor and the shift thyristor, wherein
an anode layer of the diode is shared with the gates of the light-emitting thyristor and the shift thyristor.
14. The light-emitting element according to claim 1, further comprising:
a semiconductor multilayer reflecting mirror disposed between the pnpn structure of the light-emitting thyristor and the semiconductor substrate.
15. A self-scanning light-emitting element array comprising:
a plurality of the light-emitting elements according to claim 1, wherein
a first transfer signal is applied to a cathode layer of the shift thyristor of each of odd-numbered island structures,
a second transfer signal different from the first transfer signal is applied to a cathode layer of the shift thyristor of each of even-numbered island structures, and
the gates of the shift thyristors of the adjacent island structures are electrically connected by the diode.
16. An optical writing head using the light-emitting element array according to claim 15.
17. An image forming apparatus comprising:
the optical writing head according to claim 16.