JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
Online ISSN : 1349-838X
Print ISSN : 0019-2341
ISSN-L : 0019-2341
Volume 69, Issue 2
Displaying 1-8 of 8 articles from this issue
  • Kazushi Kodama, Yoshiyuki Ishihara, Toshiyuki Todaka, Mitsuru Kanamori ...
    1985 Volume 69 Issue 2 Pages 53-58
    Published: February 01, 1985
    Released on J-STAGE: July 19, 2011
    JOURNAL FREE ACCESS
    A leakage transfomer has been used for a ballast of fluorescent lamp so far. Operating analysis of burning circuit of the fluorescent lamp used such leakage transformer is, however, difficult to get due to their non-linealities of the characteristics of lamp and magnetic characteristics of core.
    This paper introduces a method to use electric circuit and also magnetic circuit in due consideration of their non-linealities of the characteristics of lamp and magnetic characteristics of core as an analytic method of burning circuit of the fluorescent lamp used leakage transformer. Relationship between general constantsof the leakage transformer and general charasteristics of burning circuit of the fluorescent lamp can be made clear by adopting the method.
    This method, thus, will be available for designing burning circuit used leakage transformer.
    Download PDF (955K)
  • Kotaro Shimogaki, Shigeru Yamasaki, Yasuharu Yamamoto, Mitsuru Kitagaw ...
    1985 Volume 69 Issue 2 Pages 59-64
    Published: February 01, 1985
    Released on J-STAGE: July 19, 2011
    JOURNAL FREE ACCESS
    Unlike the high pressure mercury lamps or metal halide lamps, the high pressure sodium (HPS) lamps have some difficulties in the sealing process of discharge tube because of heterogeneous properties lied between niobium as eletrical conductor and ceramic end-cap for translucent alumina tube.
    A number of solder glass for ceramics to metal have been developed so far, we have tried to make one of Al2O3-CaO-Sr0-Y2O3 system, and examined the characteristics of it.
    We have made the experiments of the conventional type of HPS lamp using this solder glass.
    Herein introduced are the successful test results, which will be enough valid for practical application.
    Download PDF (7718K)
  • Kazuo Narita
    1985 Volume 69 Issue 2 Pages 65-69
    Published: February 01, 1985
    Released on J-STAGE: July 19, 2011
    JOURNAL FREE ACCESS
    Using magnesium tungstate phosphor (MgWO4) as the standard, relative quantum efficiency (Q2) of representative lamp Phosphors was determined. Only BaMg2Al16O27: Eu and YVO4: Eu showed higher Q2 than MgWO4. On the other hand, phosphor quantum efficiency in the lamp (QL) was calculated from the efficacy of the lamps coated with the individual phosphor, and was compared with Q2. Four phosphors ((Sr, Mg) 3 (PO4) 2: Sn, Y2O3: Eu, Y2SiO5: Ce, Tband (La, Ce, Tb) 2O3·0.2 SiO2·0.9 P2O5) exhibited both high Q2 values (>0.93) and the QL/Q2 ratio of greater than 0.9. This shows that these phosphors maintain their high quantum efficiency also in lamps. In other phcsphors, the QL/Q2 ratio ranges from 0.7 and 0.8, which leaves them the possibility of lamp efficacy improvement of more than 20.%.
    Download PDF (817K)
  • Akira Taya, Kazuo Narita, Jun'etsu Akiyama, Hisami Nira
    1985 Volume 69 Issue 2 Pages 70-74
    Published: February 01, 1985
    Released on J-STAGE: July 19, 2011
    JOURNAL FREE ACCESS
    As the blue component of the three band lamp, BaMg2Al16O27: Eu2+ (BAM) and (Sr, Ca) 10 (PO4) 6Cl2: Eu2+ (Sr-CAP) are most commonly used. These phosphors, however, show greater luminous flux decrease than the green and red components, leading to the shift of chromaticity during lamp operation.
    This paper describes a newly developed phoshor, (Ba, Ca, Mg) 10 (PO4) 6Cl2: Eu2+ (Ba-CAP). Preparation method, luminescence properties, degradation behavior by 185 nm irradiation and by baking are presented. This phosphor exhibits greater stability than BAM and Sr-CAP, and yields the three band lamp with a smaller color shift.
    Download PDF (720K)
  • Calculation of the Luminous Intensity and the Efficiency of the Square Grid Louvers
    Yoshihiko Tabuchi, Masanobu Nishimura, Morikazu Nakau, Mitsugu Hirata, ...
    1985 Volume 69 Issue 2 Pages 75-80
    Published: February 01, 1985
    Released on J-STAGE: July 19, 2011
    JOURNAL FREE ACCESS
    Precise studies have been made systematically, both in theoretical and experimental approaches, to decide the suitable calculating system of the illuminance in the room with the louvered ceiling, having the sufficient accuracy for the practical lighting design.
    These reports consist of two parts. This report (Part 1) refers to the calculating methods both of the efficiency and the luminous intensity distribution of the square louvers, with diffuse light source above them.
    The authors have been adopted the Zonal Cavity Method in the lighting calculations of the general lighting system, they also adopted the ZCM to the calculation for the efficiency of the louvers and divided inside walls into several parts to obtain sufficient accuracy.
    As the height of the louver with usual louver shielding angle (about 45 degrees) is rather high for the assumption of the uniform illuminance, authors divided the louver into three parts vertically and have obtained sufficient accuracy.
    Then, the accuracy of the calculation method was confirmed through the measurements of the experimental one duct cell louvers.
    Download PDF (876K)
  • Theoretical Approach of Calculation Method and Measurement in the Experimental Room
    Yoshihiko Tabuchi, Masanobu Nishimura, Morikazu Nakau, Yoshiyuki Kuchi ...
    1985 Volume 69 Issue 2 Pages 81-87
    Published: February 01, 1985
    Released on J-STAGE: July 19, 2011
    JOURNAL FREE ACCESS
    Precise studies have been made systematically, both in theoretical and experimental approaches, to decide the suitable calculating system of the illuminance in the room with the louvered ceiling, having sufficient accuracy for the practical lighting design.
    This report (Part 2) refers to the total procedure of the calculating method based on the Zonal Cavity Method as the theoretical background. The factors in respective steps in the method, the utilization factor in the ceiling cavity, the efficiency and the luminous intensity distribution of the louvers, and the utilization factor of the louvered ceiling are also refered to.
    In order to validate the total and respective steps of the method, the experimental rooms with the louvered ceiling were made, and the values in respective steps were measured and compared with the calculated values.
    Especially, in this study, as the light source above the louver, discrete fluorecent lamp luminaires were adopted instead of the continuous light source to simulate actual louvered ceiling systems.
    As a result, it was ensured that this calculating method has sufficient accuracy for normal condition of the louveres and that this is applicable for practical purpose even to the louvered ceilings which have discrete light sources.
    Download PDF (1203K)
  • Consideration of the Reasonable Spectral Sensitivity by the Principal Component Analysis
    Mamoru Tominaga, Jun'etsu Akiyama, Leo Mori
    1985 Volume 69 Issue 2 Pages 88-93
    Published: February 01, 1985
    Released on J-STAGE: July 19, 2011
    JOURNAL FREE ACCESS
    Dumet wire is used for the sealing part of the lead-in wire for lamps and electronic devices. Though the thickness of cuprous oxide layer on the wire surface has an important effect on the sealability of glass to the wire, it has been so far discriminated mainly by the visual inspection of color. In this paper a photoelectric method for that discrimination is descibed.
    By the Principal Component Analysis based on the spectral reflectances of Dumet wires oxidized in different degrees, three characteristic spectral regions, 1: 400-505 nm 2: 505-630 nm, and 3: 630-700 nm, were determined.
    The normalized spectral reflectances of the wire in the regions 1 and 3 correlate directly with the degree of oxidation, while inversely in the region 2.
    Practically, the relative degree of oxidation can be determined by the ratio of the spectral reflectances in the region 2 to those in 3. A practical measurement method using two photoelectric detectors combined with different kinds of sharp-cut-off filters is introduced.
    Download PDF (852K)
  • Yoiti Minematsu, Mitsuhiro Yamazaki
    1985 Volume 69 Issue 2 Pages 94-98
    Published: February 01, 1985
    Released on J-STAGE: July 19, 2011
    JOURNAL FREE ACCESS
    Absolute spectral reflectance of barium sulfate specimens was measured by a single integrating sphere method similar to that developed by Budde and Dodd. Barium sulfate specimens were prepared by us in 1976 and calibrated by Budde in 1976 and by Mishima in 1979, and since then they were stored on a dark shelf. Both average absolute spectral reflectance and coefficient of variation were calculated down to 240 nm. The coefficient of variation was 0.4-0.6% within a visible region and 3% at 240 nm. The average reflectance of pure barium sulfate was approximately equal to the data of Budde, and the significant difference was not observed between them. The reflectance of barium sulfate containing 0.2% poly (vinyl alcohol) as binder was somewhat deteriorated in the ultraviolet region, and the difference of reflectance caused by the setting position of specimen to the sample port of integrating sphere was observed. It is concluded that barium sulfate containing poly (vinyl alcohol) binder is not adequate as reflerence material for relative reflectance measurement.
    Download PDF (819K)
feedback
Top