1. A multi direction switch comprising:
a first cover and a second cover;
a printed circuit board (PCB) positioned between the first cover and the second cover, a first cavity being defined between the first cover and the PCB and a second cavity being defined between the second cover and the PCB;
a pair of stacked, orthogonal electrode plates positioned in the second cavity;
a spring member positioned in the first cavity; and
a button for actuating the electrode plates to move on the PCB;
wherein the second cover has a protrusion, the button has a radial portion and a wall portion extending downwardly from the radial portion, and the spring member is positioned between the protrusion and the wall portion.
2. The multi direction switch as claimed in claim 1, wherein the spring member is a discoid spring member.
3. The multi direction switch as claimed in claim 1, wherein the spring member is compressed by the wall portion to have elasticity when the button is operated and moves along multi directions.
4. The multi direction switch as claimed in claim 1, wherein the spring member has an internal margin connecting with the protrusion and an external margin connecting with the wall portion.
5. The multi direction switch as claimed in claim 1, wherein the button comprises an operation portion, a disc portion consisting of the radial portion and the wall portion, and an actuating portion between the operation portion and the disc portion, and wherein the actuate portion has a diameter smaller than that of the disc portion.
6. The multi direction switch as claimed in claim 5, wherein the disc portion is positioned in the first cavity and the actuating portion is positioned in the second cavity.
7. The multi direction switch as claimed in claim 1, wherein the second cover defines a cutout, the PCB defines a through hole, and the protrusion of the first cover is located below the cutout and the through hole.
8. The multi direction switch as claimed in claim 7, further comprising a dustproof cover attached to the second cover and jacketed on the button.
9. The multi direction switch as claimed in claim 1, wherein the second cover is a bottom cover, the first cover is a top cover, and the protrusion is formed on the bottom cover and the button extends through the top cover.
10. The multi direction switch as claimed in claim 1, further comprising a retaining plate having a pair of wing portions, and wherein the electrode plates comprise a lower electrode plate having plural ribs engaged with the wing portions.
11. The multi direction switch as claimed in claim 10, wherein the electrode plates comprise an upper electrode plate positioned between the retaining plate and the lower electrode plate.
12. The multi-direction switch comprising:
opposite first and second covers;
a printed circuit board (PCB) positioned between the first cover and the second cover, a first cavity being defined between the first cover and the PCB and a second cavity being defined between the second cover and the PCB;
a spring member positioned in the first cavity;
a pair of intersected electrode plates positioned in the second cavity; and
a button linked at an intersected position of the electrode plates to horizontally move the electrode plates on the PCB, and essentially constantly engaging the spring for restoration consideration.
13. The multi-direction switch as claimed in claim 12, wherein the printed circuit board defines a throug hole, and a portion of button extends through said through hole.
14. The multi-direction switch as claimed in claim 12, wherein the button includes an operation portion extending beyond the second cover to be exposed to an exterior.
15. The multi-direction switch as claimed in claim 12, wherein the button defines a wall portion surrounding the spring and compressing the spring during moving.
16. The multi-direction switch as claimed in claim 15, wherein the first cover defines around a center a protrusion against which the spring abuts to form a compression force when the spring is urged inwardly by the wall portion of the button.
17. A multi-direction switch comprising:
opposite first and second covers defining a receiving cavity therebetween;
a printed circuit board (PCB), a coil spring member and a pair of intersected electrode plates commonly received in the receiving cavity at different levels along an axial direction; and
a button linked at an intersected position of the electrode plates to horizontally move the electrode plates on the PCB for electrical transmission consideration, and essentially constantly engaging the spring for mechanical restoration consideration; wherein
said button includes a wall portion surrounding the coil spring member so as to urge the coil spring inside to be compressed when the button is horizontally moved.
18. The multi-direction switch as claimed in claim 17, wherein an stationary protrusion is located at a center of the coil spring member so as to function as a stopper for resist inward compression of the spring member when the button is horizontally moved.
19. The multi-direction switch as claimed in claim 17, wherein the button includes an operation portion exposed to an exterior for manual operation, and the operation portion is closer to the electrode plate than to the spring.
20. The multi-direction switch as claimed in claim 19, wherein the printed circuit board defines a through hole through which the wall portion extends.
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 lysine ester triisocyanate represented by general formula (I):
(wherein R represents lower alkylene), characterized in that the change in a hue value (APHA) of the lysine ester triisocyanate is 20 or less when it is stored for two weeks at 40\xb0 C. in a nitrogen atmosphere under blocking light.
2. The lysine ester triisocyanate according to claim 1, wherein R is ethylene.
3. The lysine ester triisocyanate according to claim 1 or 2, wherein the hue value (APHA) before storage is 50 or less.
4. A process for producing a lysine ester triisocyanate represented by general formula (I):
(wherein R represents lower alkylene), which comprises a step of bringing a mixture comprising the lysine ester triisocyanate represented by the general formula (I) into contact with activated carbon at a temperature of 10\xb0 C. to 40\xb0 C.
5. The process for producing a lysine ester triisocyanate according to claim 4, wherein the mixture comprising the lysine ester triisocyanate represented by general formula (I) has a hue value (APHA) of 100 or more.
6. The process for producing a lysine ester triisocyanate according to claim 4 or 5, wherein the mixture comprising the lysine ester triisocyanate represented by general formula (I) is a reaction mixture obtained by reacting its corresponding triamine or a salt thereof with phosgene.
7. The process for producing a lysine ester triisocyanate according to claim 4 or 5, wherein after the step of bringing a mixture comprising the lysine ester triisocyanate represented by general formula (I) into contact with activated carbon, a step of subjecting the resulting mixed liquid to thin-film distillation is carried out.
8. The process for producing a lysine ester triisocyanate according to claim 6, wherein after the step of bringing a mixture comprising the lysine ester triisocyanate represented by general formula (I) into contact with activated carbon, a step of subjecting the resulting mixed liquid to thin-film distillation is carried out.