Bulb-type lamp and manufacturing method for the bulb-type lamp

• US 6,793,373 B2
• Filed: 06/11/2003
• Issued: 09/21/2004
• Est. Priority Date: 03/27/2001
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Kakuno, Yoshinori, Matsuba, Tetsuo
• Primary Examiner(s): Ward, John Anthony
• Application Number:
  US10/460,706
• Publication Number:
  US 20030210550A1
• Time in Patent Office: 468 Days
• Field of Search: 362/294, 362/373, 362/260, 362/261, 362/186, 313/493, 313/634, 313/318.02, 315/56, 315/58, 445/22, 445/26, 445/27, 445/69
• US Class Current: 362/260
• CPC Class Codes: H01J 5/60 for fastening by mechanical means
• CPC Class Codes: H01J 9/247 specially adapted for gas-discharge lamps

Abstract

To provide a bulb-type lamp in which a globe is fixed to a case without a tilt, and a manufacturing method for the bulb-type lamp. The globe is bonded to a connector using a thermosetting resin, in a state where a neck part of the globe is inserted in a groove of the connector without contacting the bottom of the groove. The connector is then fixed to the case by means of a fitting construction. This makes it unnecessary to perform a heating process to cure an adhesive after an envelope is formed by the globe and the case. Hence the tilting of the globe caused by the thermal expansion of air in the envelope can be prevented.

Claims

1. A manufacturing method for a bulb-type lamp, comprising:

a holding step for holding a holder which has a stand supporting an electric ballast, by a case which has an opening, in a state where the holder is inserted in the case through the opening with the electric ballast being inserted first;

a bonding step for bonding a globe which has a constructed neck part at one end, to a connector which has a ring-shaped groove in which the neck part of the groove can be inserted, in a state where the neck part is inserted in the groove; and

a fixing step for fixing the connector to which the globe is bonded, to one of the case and the holder by a fitting construction, in the opening of the case.

2. The manufacturing method of claim 1, wherein in the bonding step a fixed distance is maintained between a furthermost end of the connector and a furthermost end of the globe, and an adhesive is injected into the groove while keeping the neck part which is inserted in the groove from contact with a bottom of the groove, to bond the globe to the connector.

3. The manufacturing method of claim 1, wherein

the bulb-type lamp is a bulb-type fluorescent lamp in which (a) the globe is a hollow spherical member having an open end at which the neck part is formed, and (b) a light diffusion film is formed on an internal surface of the globe using an adhesive in which a light diffusion material is dispersed, and

when the adhesive is applied to the internal surface of the globe to form the light diffusion film, an excess of the adhesive drops and is gathered in the groove of the connector, the gathered adhesive being used to bond the globe to the connector in the bonding step.

4. The manufacturing method of claim 3, wherein the applied adhesive is one of a water-soluble acrylic emulsion, an organic nitro-cellulose and an ethyl cellulose.

5. The manufacturing method of claim 3, wherein the applied adhesive includes a diffusion powder.

6. The manufacturing method of claim 5, wherein the diffusion powder includes at least one of calcium carbonate, magnesium oxide, silicon, titanium oxide and phosphor.

7. A manufacturing method for a lamp, comprising the steps of:

providing a hollow globe with an open bottom;

mounting a connector with a groove about the open bottom, the open bottom positioned a distance above a lower portion of the groove to permit liquid flow;

applying a liquid adhesive to coat and surround the open bottom in the groove;

adhering the hollow globe to the connector by setting the adhesive;

providing a holder with a light inducing member;

providing a case unit;

positioning the holder with the light inducing member to extend within the hollow globe; and

affixing the case unit with the holder with the light inducing member to the connector adhered to the hollow globe.

8. The manufacturing method of claim 7, wherein the light adhesive includes diffusion powder and it is applied to an interior of the hollow globe in sufficient quantity to coat the interior for diffusion of light emitted there through and accumulate in the groove to surround the open bottom.

9. The manufacturing method of claim 8, wherein the light inducing member is a fluorescent tube.

10. The manufacturing method of claim 7, wherein the hollow globe is sealed with a central opening to enable a plasma discharge of excited gas contained therein.

11. The manufacturing method of claim 10, wherein the light inducing member is an inductor coil.