Light emitting device
A light emitting device includes light transmitting resin loaded between a lens and a light emitting element. The structure of the device enables the lens to be fixed to a required position without reducing the light transmittance. The light emitting device 1 includes a light emitting element 2 and a separate lens 3 supported by a support member 4 . The lens 3 is fixed to the support member 4 by hardening the resin 13 between the element 2 and the lens 3 in the support member 4 . Mutually engaging male and female portions are provided between the support member 4 and the lens 3 . N male portions (n is a positive integer) are provided for (n+α) female portions (α is a positive integer). The female portions allow the resin 13 to communicate with the outside of the device. The α female portions serve as a leak portion for discharging the resin 13 or bubbles to the outside when the lens 3 is fixed.
1. A light emitting device comprising:
a support member including a recess having an inner circumferential surface;
a light emitting element disposed in the recess; and
a lens disposed in the recess for covering the light emitting element;
wherein the lens includes a flange having an outer circumferential surface; and
wherein a clearance is formed between the outer circumferential surface of the flange of the lens and the inner circumferential surface of the recess of the support member;
wherein the lens is fixed to the support member by hardening of light transmitting resin filled in the recess between the light emitting element and the lens;
wherein the device further comprises male and female engaging portions to be fitted to each other between the support member and the lens;
wherein the male engaging portions include only n number of male portions (where n is a positive integer), whereas the female engaging portions include n+α female portions (where α is a positive integer) allowing the light transmitting resin to communicate with an outside of the device, all n number of male portions being removably engaged to n number of female portions when the lens is assembled to the support member, and the α female portions serve as a leak portion for discharging the light transmitting resin or bubbles to the outside when the fixing of the lens is performed; and
wherein all of the n+α female engaging portions are spaced from an optical axis of the lens by an equal distance for allowing each of the n male portions to be fitted to any selected one of all n+α female engaging portions.
2. The light emitting device according to claim 1 ,
wherein the clearance is circularly annular and has a constant width along the entire outer circumferential surface of the flange.
3. The light emitting device according to claim 1 ,
wherein the lens is positioned to the support member by n sets of male and female portions fitted to each other.
4. The light emitting device according to claim 1 ,
wherein the recess has a bottom surface to which the light emitting element is fixed, the lens being fixed at an intermediate portion of the recess in a depth direction of the recess.
5. The light emitting device according to claim 4 ,
wherein the intermediate portion of the recess in the depth direction is formed with a support surface for supporting a surface of the lens on a light emitting element side, and the male portions and the female portions are provided between the surface of the lens on the light emitting element side and the support surface.
6. The light emitting device according to claim 4 ,
wherein the male portions and the female portions are provided between a side surface of the lens and an inner side surface of the recess.
7. The light emitting device according to claim 1 ,
wherein all of the n male engaging portions are spaced from the optical axis of the lens by a same distance as the n+α female engaging portions.
8. The light emitting device according to claim 1 ,
wherein each of the male portions comprises a rib, and each of the female portions comprises a groove for fitting to the rib.
9. The light emitting device according to claim 1 ,
wherein the recess includes a support surface at an intermediate height of the recess, each of the male portions comprising a rib formed integrally with the lens, and each of the female portions comprising a groove formed in the support surface for fitting to the rib.
10. A light emitting device comprising:
a support member including a recess having an inner circumferential surface;
a light emitting element disposed in the recess; and
a lens disposed in the recess for covering the light emitting element;
wherein the lens is fixed to the support member by hardening of light transmitting resin filled in the recess between the light emitting element and the lens;
wherein the device further comprises male and female engaging portions to be fitted to each other between the support member and the lens;
wherein the male engaging portions include only n number of male portions (where n is a positive integer), whereas the female engaging portions include n+α female portions (where α is a positive integer) allowing the light transmitting resin to communicate with an outside of the device, all n number of male portions being removably engaged to n number of female portions when the lens is assembled to the support member, and the α female portions serve as a leak portion for discharging the light transmitting resin or bubbles to the outside when the fixing of the lens is performed; and
wherein all of the n+α female engaging portions are spaced from an optical axis of the lens by an equal distance for allowing each of the n male portions to be fitted to any selected one of all n+α female engaging portions.
11. A light emitting device comprising:
a support member including a recess having an inner circumferential surface;
a light emitting element disposed in the recess; and
a lens disposed in the recess for covering the light emitting element;
wherein the lens is fixed to the support member by hardening of light transmitting resin filled in the recess between the light emitting element and the lens;
wherein the device further comprises male and female engaging portions to be fitted to each other between the support member and the lens;
wherein the male engaging portions include only n number of male portions (where n is a positive integer), whereas the female engaging portions include n+α female portions (where α is a positive integer) allowing the light transmitting resin to communicate with an outside of the device, all n number of male portions being removably engaged to n number of female portions when the lens is assembled to the support member, and the α female portions serve as a leak portion for discharging the light transmitting resin or bubbles to the outside when the fixing of the lens is performed; and
wherein all of the n+α female engaging portions are spaced from an optical axis of the lens by an equal distance for allowing each of the n male portions to be fitted to any selected one of all n+α female engaging portions, and
wherein a pathway is formed between the support member and the lens, the pathway comprising the α female portion, and being suitable for discharging the light transmitting resin or bubbles to the outside when the fixing of the lens is performed.
12. The light emitting device according to claim 11 ,
wherein the pathway further comprises a clearance formed between the lens and the support member.