Discharge lamp with discharge tube fixture arrangement and method for manufacturing the same

Abstract

There is provided a low pressure discharge lamp, which comprises a discharge tube, a lamp base holding the discharge tube, and a base cap () for covering the lamp base. The base cap () also provides mechanical support to the discharge tube. The base cap () comprises tube openings () for receiving end parts of the discharge tube. The base cap () further comprises an adhesive space () adjacent to a tube opening (), the adhesive space containing an amount of adhesive. The adhesive space () is open toward the discharge tube. The adhesive contained in the adhesive space () adheres to an end part of the discharge tube and thereby fixes the discharge tube to the base cap (). The base cap comprises at least one upper transversal member () and at least one lower transversal member (). The transversal members () extend substantially in a plane parallel to a plane of the tube opening () adjacent to the adhesive space (). The upper and lower transversal members () limit the adhesive space () at least partly. There is also provided a method for manufacturing a discharge lamp with a base cap () described. In the method, the adhesive space is at least partly limited with the upper and lower transversal members. According to the method, ends of the discharge tube are inserted into the tube openings () of the base cap (). An amount of adhesive is fed in the adhesive space (), and the adhesive is forced to spill out from the adhesive space () and to contact the ends of the discharge tube. The adhesive is allowed to adhere to an end part of the discharge tube and thereby the discharge tube is fixed to the base cap (). A base cap () having an upper and lower transversal member () as above is also claimed.